The cell. Lecture 5. The Cell membrane and Membrane Proteins. Cellular membranes A cell is the simplest collection of matter that can live

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "The cell. Lecture 5. The Cell membrane and Membrane Proteins. Cellular membranes A cell is the simplest collection of matter that can live"

Transcription

1 Lecture 5 The cell The Cell membrane and Membrane Proteins Ameoba- single celled organism A single human cell The Cell is the simplest collec4on of ma9er that can live Cells 4ssue organ Cellular membranes A cell is the simplest collection of matter that can live Phospho-lipids Plasma membrane separates the living cell from its non-living environment Cell membranes are fluid mosaics of lipids and proteins Exhibit selective permeability allowing some substances to cross more easily than others 1

2 Plasma membrane is made up of a phospholipid bilayer Model of the cell membrane Cell membrane Membrane proteins Phospholipids- fabric of the cell membrane Proteins determine membranes specific functions Different types of cells-different types of proteins Different organelles within a cell-different proteins Lipids are always moving sideways Proteins drift slowly Cholesterol act as a temperature buffer keeping the membrane fluid at moderate temperatures Membranes must be fluid to work 2

3 Membrane proteins 2 types of membrane protein 1. Integral proteins penetrate the hydrophobic core, many are transmembrane Transmembrane protein eg Bacteriorhodopsin 2. Peripheral proteins are not embedded in the membrane, they are often bound to exposed integral proteins or loosely to the surface of the membrane Membrane proteins Membrane protein func4ons Hydrophilic channel or Carrier protein Tight junc4ons formed between cells Team of enzymes Glycoprotein- ID tag Stablises loca4on of certain proteins 3

4 Transport across the membrane Transport across a membrane Regulation of transport across the cell membrane-essential its to existence Eg. Muscle cells Sugars, amino acids, oxygen, ions in Carbon dioxide, ions, metabolic waste Cell membrane is selectively permeable out Selective Permeabilty Membrane proteins key role in regulating transport Diffusion-passive transport Diffusion- tendency for molecules of any substance to spread evenly into available space Any substance will diffuse down its concentration gradient- spontaneous process no energy required Small hydrophobic molecules will diffuse across the membrane Eg. Oxygen crosses into cells performing cellular respira4on 4

5 Selective permeability Charged and polar molecules can cross the membrane by passing through transport proteins Transport proteins span the membrane Transport proteins are very specific 2 types- channel and carrier Channel protein eg. aquaporin Carrier protein eg glucose Facilitated Diffusion-Passive Transport Diffusion of hydrophilic solutes across the membrane must be facilitated by transport proteins Transport proteins are very specific channel transporter eg. aquaporin Ion channel eg. Sodium chanel Channel proteins provide hydrophilic corridors Ion channels Gated ion channelsstimulus regulated Ligand gated ion channel eg. neurotransmi9ers Facilitated Diffusion-Passive Transport Carrier proteinschange shape in order to translocate substances across the membrane Changes in shape triggered by the binding and release of the transported molecule Carrier protein eg. Glucose transporter Diffusion-passive transport Uniport-movement of one solute from one side to the other Co-transport Symport-two solutes in the same direction Antiport-two solutes in opposite directions Solutes will diffuse down their concentration gradient Facilitated Diffusion is s4ll passive because the solute moves down the concentra4on gradient 5

6 Active transport-uses energy Movement of substances against their concentration gradient across the membrane From a low concentration to a high concentration Active transport ATP supplies the energy for active transport ATP can transfer its terminal phosphate group directly to the transport protein-transfer of energy Eg of a carrier protein that requires ATP to transport is the sodium-potassium pump Requires work- cell uses energy- active All active transporters are carrier proteins Active transport enables a cell to maintain higher internal concentrations of molecule compared to the external environment Eg. Low [Na+] and high [K+] compared with [extracellular] Sodium-potassium pump Membrane potential is the difference in voltage (or electrical potential difference) between the interior and exterior of a cell Resting membrane potential -inside of the cell has a negative voltage (millivolts; mv) with respect to the outside of the cell (0 mv). Sodium- potassium pump = electrogenic pump = Generates a voltage across the membrane - More nega4vely charged inside a cell than outside - creates an electrochemical gradient 6

7 Membrane potential Voltage across the membrane = membrane potential -storage of electrical potential energy This potential energy can be tapped into by the cell to carry out work eg.: the diffusion of H+ ions back down their electrochemical gradient can be coupled to the active transport of Sucrose against its concentration gradient Membrane potential Upon stimulation of the cell, this negative voltage inside the cell (negative membrane potential) may become positive-depolarisation More negative-hyperpolarisation Important in Neurons-Generation of a membrane potential will induce electric current (action potential) to flow rapidly to other points in the membrane Mitochondria-the polarisation state determines life or death. Depolarisation =activation of cell death In Summary...Transport across the membrane Summary 1. Proteins - What are they? And why are they important? 2. The building blocks (aa s) and how they are connected 3. The hierarchy of protein structure 4. Three-dimensional protein structure 5. Proteins in disease 6. Enzymes as an example of complex proteins 7. Cell membranes and the role of proteins 7

8 Biology Campbell and Reece Chapters 5, 7 and 8 BY1010/modules/BY1011 8

Lecture 5. The Cell The cell membrane and Membrane Proteins

Lecture 5. The Cell The cell membrane and Membrane Proteins Lecture 5 The Cell The cell membrane and Membrane Proteins The cell Ameoba- single celled organism A single human cell The Cell is the simplest collec4on of ma9er that can live Cells 4ssue organ The cell

More information

Six major functions of membrane proteins: Transport Enzymatic activity

Six major functions of membrane proteins: Transport Enzymatic activity CH 7 Membranes Cellular Membranes Phospholipids are the most abundant lipid in the plasma membrane. Phospholipids are amphipathic molecules, containing hydrophobic and hydrophilic regions. The fluid mosaic

More information

The Cell Membrane: Structure and Func4on

The Cell Membrane: Structure and Func4on The Cell Membrane: Structure and Func4on Overview of the Cell Membrane All cells have a cell membrane Separates living cell from nonliving surroundings Mainly made of phospholipids proteins & other macromolecules

More information

Membrane Structure and Function

Membrane Structure and Function Membrane Structure and Function -plasma membrane acts as a barrier between cells and the surrounding. -plasma membrane is selective permeable -consist of lipids, proteins and carbohydrates -major lipids

More information

BSC 2010 - Exam I Lectures and Text Pages. The Plasma Membrane Structure and Function. Phospholipids. I. Intro to Biology (2-29) II.

BSC 2010 - Exam I Lectures and Text Pages. The Plasma Membrane Structure and Function. Phospholipids. I. Intro to Biology (2-29) II. BSC 2010 - Exam I Lectures and Text Pages I. Intro to Biology (2-29) II. Chemistry of Life Chemistry review (30-46) Water (47-57) Carbon (58-67) Macromolecules (68-91) III. Cells and Membranes Cell structure

More information

The structure and function of the plasma membrane

The structure and function of the plasma membrane The structure and function of the plasma membrane Our current view of membrane structure is based on the fluid mosaic model. This model proposes that membranes are not rigid, with molecules locked into

More information

Cell membrane & transport. Dr. Ali Ebneshahidi. Copyright 2004 Pearson Education, Inc., publishing as Benjamin Cummings

Cell membrane & transport. Dr. Ali Ebneshahidi. Copyright 2004 Pearson Education, Inc., publishing as Benjamin Cummings Cell membrane & transport Dr. Ali Ebneshahidi Cell Membrane To enclose organelles and other contents in cytoplasm To protect the cell To allow substances into and out of the cell To have metabolic reactions

More information

A membrane s structure and functions are determined by its constituents: lipids, proteins, and carbohydrates.

A membrane s structure and functions are determined by its constituents: lipids, proteins, and carbohydrates. A membrane s structure and functions are determined by its constituents: lipids, proteins, and carbohydrates. The general design of membranes is known as the fluid mosaic model. Phospholipids form a continuous

More information

Allows certain materials and of the cell. The cell membrane is selectively permeable

Allows certain materials and of the cell. The cell membrane is selectively permeable Overview The cell membrane forms a barrier around the cell and separates it from the outside environment What is the main function of the cell membrane? Allows certain materials and of the cell The cell

More information

1. The lipid layer that forms the foundation of cell membranes is primarily composed of molecules called.

1. The lipid layer that forms the foundation of cell membranes is primarily composed of molecules called. Cell Membranes 1. The lipid layer that forms the foundation of cell membranes is primarily composed of molecules called. 2. Due to the repellent nature of the polar water molecules, the tails of the phospholipids

More information

Ionic Basis of Membrane Potential

Ionic Basis of Membrane Potential Ionic Basis of Membrane Potential Dr Sergey Kasparov School of Medical Sciences, Room E9 Teaching home page: http://www.bristol.ac.uk/phys-pharm/personal/virallab/teaching/downloads.php 1.Phospholipid

More information

4. Biology of the Cell

4. Biology of the Cell 4. Biology of the Cell Our primary focus in this chapter will be the plasma membrane and movement of materials across the plasma membrane. You should already be familiar with the basic structures and roles

More information

FIGURE 2.18. A. The phosphate end of the molecule is polar (charged) and hydrophilic (attracted to water).

FIGURE 2.18. A. The phosphate end of the molecule is polar (charged) and hydrophilic (attracted to water). PLASMA MEMBRANE 1. The plasma membrane is the outermost part of a cell. 2. The main component of the plasma membrane is phospholipids. FIGURE 2.18 A. The phosphate end of the molecule is polar (charged)

More information

Chapter 8. Movement across the Cell Membrane. AP Biology

Chapter 8. Movement across the Cell Membrane. AP Biology Chapter 8. Movement across the Cell Membrane More than just a barrier Expanding our view of cell membrane beyond just a phospholipid bilayer barrier phospholipids plus Fluid Mosaic Model In 1972, S.J.

More information

The Cell Membrane MEMBRANE STRUCTURE AND FUNCTION. Mader: Chapter Membranes are a fluid mosaic of phospholipids and proteins

The Cell Membrane MEMBRANE STRUCTURE AND FUNCTION. Mader: Chapter Membranes are a fluid mosaic of phospholipids and proteins The Cell Membrane Mader: Chapter 4 MEMBRANE STRUCTURE AND FUNCTION 5.1 Membranes are a fluid mosaic of! Membranes are composed of phospholipids and proteins Membranes are commonly described as a fluid

More information

8.2 Cell Transport. **The cell must move different substances into and out of the cell. **8.2 discusses the different methods of cell transport

8.2 Cell Transport. **The cell must move different substances into and out of the cell. **8.2 discusses the different methods of cell transport 8.2 Bellringer.. (1)In your own words, define passive, active, and transport Now, imagine sitting in a boat that is moving downstream with the current. Then, imagine a small motor to move the same boat

More information

Cell Membrane Structure and Function. Prof. Dr. Turgut Ulutin

Cell Membrane Structure and Function. Prof. Dr. Turgut Ulutin Cell Membrane Structure and Function Prof. Dr. Turgut Ulutin Why do we need the plasma membrane? Keeping the goods concentrated Keeping harmful materials out Transports substances in and out of the cell

More information

Homeostasis and Membrane Transport. Unit 2 Homeostasis

Homeostasis and Membrane Transport. Unit 2 Homeostasis Homeostasis and Membrane Transport Unit 2 Homeostasis What determines whether a substance can pass through a membrane or not? Chemical properties of the molecule attempting to cross the membrane Movement

More information

Homeostasis & Cell Transport

Homeostasis & Cell Transport In order to maintain life, organisms must regulate the balance of materials inside and outside of the cell. This is accomplished by the transport of materials through the plasma membrane. Homeostasis &

More information

Ch. 8 - The Cell Membrane

Ch. 8 - The Cell Membrane Ch. 8 - The Cell Membrane 2007-2008 Phospholipids Phosphate head hydrophilic Fatty acid tails hydrophobic Arranged as a bilayer Phosphate attracted to water Fatty acid repelled by water Aaaah, one of those

More information

Transmembrane proteins span the bilayer. α-helix transmembrane domain. Multiple transmembrane helices in one polypeptide

Transmembrane proteins span the bilayer. α-helix transmembrane domain. Multiple transmembrane helices in one polypeptide Transmembrane proteins span the bilayer α-helix transmembrane domain Hydrophobic R groups of a.a. interact with fatty acid chains Multiple transmembrane helices in one polypeptide Polar a.a. Hydrophilic

More information

1.1.2. thebiotutor. AS Biology OCR. Unit F211: Cells, Exchange & Transport. Module 1.2 Cell Membranes. Notes & Questions.

1.1.2. thebiotutor. AS Biology OCR. Unit F211: Cells, Exchange & Transport. Module 1.2 Cell Membranes. Notes & Questions. thebiotutor AS Biology OCR Unit F211: Cells, Exchange & Transport Module 1.2 Cell Membranes Notes & Questions Andy Todd 1 Outline the roles of membranes within cells and at the surface of cells. The main

More information

Unit 2: Cells, Membranes and Signaling CELL MEMBRANE. Chapter 5 Hillis Textbook

Unit 2: Cells, Membranes and Signaling CELL MEMBRANE. Chapter 5 Hillis Textbook Unit 2: Cells, Membranes and Signaling CELL MEMBRANE Chapter 5 Hillis Textbook HOW DOES THE LAB RELATE TO THE NEXT CHAPTER? SURFACE AREA: the entire outer covering of a cell that enables materials pass.

More information

BIOLOGICAL MEMBRANES: FUNCTIONS, STRUCTURES & TRANSPORT

BIOLOGICAL MEMBRANES: FUNCTIONS, STRUCTURES & TRANSPORT BIOLOGICAL MEMBRANES: FUNCTIONS, STRUCTURES & TRANSPORT UNIVERSITY OF PNG SCHOOL OF MEDICINE AND HEALTH SCIENCES DISCIPLINE OF BIOCHEMISTRY AND MOLECULAR BIOLOGY BMLS II / B Pharm II / BDS II VJ Temple

More information

Cells Need to Exchange Materials with the Extracellular Fluid. Membrane Transport. Plasma Membrane. Cells Must Control Movements of Materials

Cells Need to Exchange Materials with the Extracellular Fluid. Membrane Transport. Plasma Membrane. Cells Must Control Movements of Materials Membrane Transport Chapter 6 Cells Need to Exchange Materials with the Extracellular Fluid Take in nutrients O 2 energy substrates building materials cofactors Dispose of wastes CO 2 Urea Cells Must Control

More information

Transport Across Cell Membranes

Transport Across Cell Membranes Transport Across Cell Membranes CELL MEMBRANE STRUCTURE A phospholipid bilayer makes up the main part of the cell membrane Each phospholipid molecule contains a charged polar head (H 2 O-loving) and non-polar,

More information

CHAPTER 5.1 5.2: Plasma Membrane Structure

CHAPTER 5.1 5.2: Plasma Membrane Structure CHAPTER 5.1 5.2: Plasma Membrane Structure 1. Describe the structure of a phospholipid molecule. Be sure to describe their behavior in relationship to water. 2. What happens when a collection of phospholipids

More information

Cell Membrane Coloring Worksheet

Cell Membrane Coloring Worksheet Cell Membrane Coloring Worksheet Composition of the Cell Membrane & Functions The cell membrane is also called the plasma membrane and is made of a phospholipid bilayer. The phospholipids have a hydrophilic

More information

The Cell Membrane and Transport

The Cell Membrane and Transport The Cell Membrane and Transport Membrane Structure Fluid Mosaic Structure: The Fluid Part Phospholipids: main lipid in the cell membrane; in a bilayer Polar head = attracted to water - hydrophilic Non-polar

More information

Cell Membrane & Tonicity Worksheet

Cell Membrane & Tonicity Worksheet NAME ANSWER KEY DATE PERIOD Cell Membrane & Tonicity Worksheet Composition of the Cell Membrane & Functions The cell membrane is also called the PLASMA membrane and is made of a phospholipid BI-LAYER.

More information

AP Biology. The Cell Membrane

AP Biology. The Cell Membrane The Cell Membrane Phospholipids Phosphate head hydrophilic Fatty acid tails hydrophobic Arranged as a bilayer Phosphate attracted to water Fatty acid repelled by water Aaaah, one of those structure function

More information

Cells and Their Housekeeping Functions Cell Membrane & Membrane Potential

Cells and Their Housekeeping Functions Cell Membrane & Membrane Potential Cells and Their Housekeeping Functions Cell Membrane & Membrane Potential Shu-Ping Lin, Ph.D. Institute of Biomedical Engineering E-mail: splin@dragon.nchu.edu.tw Website: http://web.nchu.edu.tw/pweb/users/splin/

More information

7-3 Cell Boundaries. Diffusion Through Cell Boundaries

7-3 Cell Boundaries. Diffusion Through Cell Boundaries Diffusion Through Cell Boundaries Every living cell exists in a liquid environment. The cell membrane regulates movement of dissolved molecules from the liquid on one side of the membrane to the liquid

More information

PART I: Neurons and the Nerve Impulse

PART I: Neurons and the Nerve Impulse PART I: Neurons and the Nerve Impulse Identify each of the labeled structures of the neuron below. A. B. C. D. E. F. G. Identify each of the labeled structures of the neuron below. A. dendrites B. nucleus

More information

Chapter 7: Membrane Structure and Function

Chapter 7: Membrane Structure and Function Name Period Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins 1. The large molecules of all living things fall into just four main classes. Name them. 2. Explain what is meant when

More information

What will you learn?

What will you learn? What will you learn? Cell Membrane and Transport PLO B9 B10 It is expected that students will analyse the structure and function of the cell membrane explain why cells divide when they reach a particular

More information

Membrane Structure & Function (Outline)

Membrane Structure & Function (Outline) Membrane Structure & Function (Outline) Basic function, biochemical composition, and physical fluid state Role of cholesterol for animal cells membranes. Summarize the functions of membrane proteins. Traffic

More information

Modes of Membrane Transport

Modes of Membrane Transport Modes of Membrane Transport Transmembrane Transport movement of small substances through a cellular membrane (plasma, ER, mitochondrial..) ions, fatty acids, H 2 O, monosaccharides, steroids, amino acids

More information

MEMBRANE STRUCTURE AND FUNCTION. Membrane phospholipids form a bilayer. In membranes, phospholipids form a bilayer

MEMBRANE STRUCTURE AND FUNCTION. Membrane phospholipids form a bilayer. In membranes, phospholipids form a bilayer MEMBRANE STRUCTURE AND FUNCTION Membranes organize the chemical activities of cells Membranes provide structural order for metabolism Form most of the cell's organelles Compartmentalize chemical reactions

More information

Cell Biology - Part 2 Membranes

Cell Biology - Part 2 Membranes Cell Biology - Part 2 Membranes The organization of cells is made possible by membranes. Membranes isolate, partition, and compartmentalize cells. 1 Membranes isolate the inside of the cell from the outside

More information

Membrane Structure and Function - 1

Membrane Structure and Function - 1 Membrane Structure and Function - 1 The Cell Membrane and Interactions with the Environment As mentioned earlier, the boundary between any cell and its environment is the plasma membrane. Each cell must

More information

Cell Membranes. Cell Membranes. Passive and Active Transport. Homeostasis Requires Exchange of Materials. Water and Solute Transport

Cell Membranes. Cell Membranes. Passive and Active Transport. Homeostasis Requires Exchange of Materials. Water and Solute Transport Homeostasis Requires Exchange of Materials Water and Solute Transport Transportation of solutes in solution Movement between external and internal environments Movement between internal environment and

More information

Membrane Structure and Function

Membrane Structure and Function Chapter 7 Membrane Structure and Function Lecture Outline Overview: Life at the Edge The plasma membrane separates the living cell from its surroundings. This thin barrier, 8 nm thick, controls traffic

More information

Chapter 5 The Plasma Membrane and Transport

Chapter 5 The Plasma Membrane and Transport Chapter 5 The Plasma Membrane and Transport State Standard Standard 1.a. Membrane Function 1, Forms a boundary between living cells and their surroundings. 2. Controls the movement of molecules into and

More information

The Lipid Bilayer Is a Two-Dimensional Fluid

The Lipid Bilayer Is a Two-Dimensional Fluid The Lipid Bilayer Is a Two-Dimensional Fluid The aqueous environment inside and outside a cell prevents membrane lipids from escaping from bilayer, but nothing stops these molecules from moving about and

More information

Biological cell membranes

Biological cell membranes Unit 14: Cell biology. 14 2 Biological cell membranes The cell surface membrane surrounds the cell and acts as a barrier between the cell s contents and the environment. The cell membrane has multiple

More information

Keystone Review Practice Test Module A Cells and Cell Processes. 1. Which characteristic is shared by all prokaryotes and eukaryotes?

Keystone Review Practice Test Module A Cells and Cell Processes. 1. Which characteristic is shared by all prokaryotes and eukaryotes? Keystone Review Practice Test Module A Cells and Cell Processes 1. Which characteristic is shared by all prokaryotes and eukaryotes? a. Ability to store hereditary information b. Use of organelles to control

More information

Cell membrane. Multiple Choice Identify the choice that best completes the statement or answers the question.

Cell membrane. Multiple Choice Identify the choice that best completes the statement or answers the question. Cell membrane Multiple Choice Identify the choice that best completes the statement or answers the question. 1. Which of the following types of molecules are the major structural components of the cell

More information

Cell Membranes Chapt 5. The Cell Membrane. Cell Membrane: At Very High Magnification & in color

Cell Membranes Chapt 5.  The Cell Membrane. Cell Membrane: At Very High Magnification & in color Cell Membranes Chapt 5 www.cellsalive.com/ The Cell Membrane Cell Membrane: At Very High Magnification & in color 1 Membrane Structure http://users.rcn.com/jkimball.ma.ultranet/biologypages/c/cellmembranes.html

More information

Division Ave High School AP Biology

Division Ave High School AP Biology The Cell Membrane https://youtu.be/y31dlj6ugge Journal Diagrams Shark book pg. 82 Wolves book pg. 88-89 Membrane Proteins Copy table Cell Membrane Proteins Fluid Mosaic Model Cell Membrane Phospholipids

More information

CELL MEMBRANES, TRANSPORT, and COMMUNICATION. Teacher Packet

CELL MEMBRANES, TRANSPORT, and COMMUNICATION. Teacher Packet AP * BIOLOGY CELL MEMBRANES, TRANSPORT, and COMMUNICATION Teacher Packet AP* is a trademark of the College Entrance Examination Board. The College Entrance Examination Board was not involved in the production

More information

The human respiratory system includes the nose, the larynx, and the lungs. This body system helps maintain homeostasis by

The human respiratory system includes the nose, the larynx, and the lungs. This body system helps maintain homeostasis by Study Island 1. During heatstroke, the body can't dispose of excess heat. As a result, the homeostatic balance is disturbed, and internal body temperatures can reach as much as 110. Heatstroke is dangerous

More information

CELL MEMBRANES and TRANSPORT. Regular Biology Mr. Wilbrandt

CELL MEMBRANES and TRANSPORT. Regular Biology Mr. Wilbrandt CELL MEMBRANES and TRANSPORT Regular Biology Mr. Wilbrandt 1 Targets I will be able to.. Identify the parts of the cell or plasma membrane Compare and contrast how the different parts of the membrane work.

More information

Chapter 5: Homeostasis and Transport Lesson 2: Cell Transport-Passive and Active

Chapter 5: Homeostasis and Transport Lesson 2: Cell Transport-Passive and Active Chapter 5: Homeostasis and Transport Lesson 2: Cell Transport-Passive and Active Lesson One helped us to learn the different cell structures that are involved in cell transport. In this lesson you will

More information

10/5/2011 MEMBRANE TRANSPORT MEMBRANE TRANSPORT

10/5/2011 MEMBRANE TRANSPORT MEMBRANE TRANSPORT MEMBRANE TRANSPORT Expected Learning Outcomes Explain what is meant by a selectively permeable membrane. Describe the various mechanisms for transporting material through the plasma membrane. Define osmolarity

More information

Cell Membrane Structure (and How to Get Through One)

Cell Membrane Structure (and How to Get Through One) Cell Membrane Structure (and How to Get Through One) A cell s membrane is a wall of sorts that defines the boundaries of a cell. The membrane provides protection and structure for the cell and acts as

More information

Big Idea: The plasma membrane allows the cell to separate the extracellular (outside cell) environment from the inside of the cell while still

Big Idea: The plasma membrane allows the cell to separate the extracellular (outside cell) environment from the inside of the cell while still Big Idea: The plasma membrane allows the cell to separate the extracellular (outside cell) environment from the inside of the cell while still allowing nutrients in the cell and wastes out of the cell.

More information

IB104 - Lecture 9 - Membranes

IB104 - Lecture 9 - Membranes There have been many magnificent boats built to try to reach 50 knots. This was the creation of an Australian team that held the record for more than a decade, from 1993 till 2005, at 46.5 knots with their

More information

Cell Membrane. The cell membrane is flexible and allows a unicellular organism to move

Cell Membrane. The cell membrane is flexible and allows a unicellular organism to move Cell Membrane Outer membrane of the cell to protect its contents Regulates the molecules that pass in and out of the cell (selectively permeable) Give the cell its shape Cell Membrane Outer membrane of

More information

Total body water ~(60% of body mass): Intracellular fluid ~2/3 or ~65% Extracellular fluid ~1/3 or ~35% fluid. Interstitial.

Total body water ~(60% of body mass): Intracellular fluid ~2/3 or ~65% Extracellular fluid ~1/3 or ~35% fluid. Interstitial. http://www.bristol.ac.uk/phys-pharm/teaching/staffteaching/sergeykasparov.htmlpharm/teaching/staffteaching/sergeykasparov.html Physiology of the Cell Membrane Membrane proteins and their roles (channels,

More information

Cells, Membranes, Tissues and Skin

Cells, Membranes, Tissues and Skin Session Objectives. What you will cover Basic cell organelles Plasma membrane structure Basic function of membrane proteins Tissues Skin Cells, Membranes, Tissues and Skin Your objectives are List the

More information

Animal Physiology. Topic: Introduction

Animal Physiology. Topic: Introduction Animal Physiology Topic: Introduction Badiozaman Sulaiman BSc.(UKM), MSc.(USM) Molecular Biology Department of Zoology Faculty of Resource Science & Technology Universiti Malaysia Sarawak This OpenCourseWare@UNIMAS

More information

PASSIVE TRANSPORT PROCESSES

PASSIVE TRANSPORT PROCESSES BIOZONE Assignment #2 Cell Membrane Transport PASSIVE TRANSPORT PROCESSES 1. Describe two properties of an exchange surface that would facilitate rapid diffusion rates*: (a) thin membrane (b) porous membrane

More information

I. What is the structure of the plasma membrane and what functions does it make possible?

I. What is the structure of the plasma membrane and what functions does it make possible? Subquestions: I. What is the structure of the plasma membrane and what functions does it make possible? A. What is the structure of the membrane? B. What are the following terms, how does the membrane

More information

Cell membranes and transport. Learning Objective:

Cell membranes and transport. Learning Objective: Cell membranes and transport Content Fluid mosaic model of membrane structure Movement of substances into and out of cells Learning Objective: a. Describe and explain the fluid mosaic model of membrane

More information

Membrane Transport. Extracellular Concentration of X

Membrane Transport. Extracellular Concentration of X Use the following graph to answer questions 1 and 2. Rate of diffusion of X into the cell 1. Which of the following processes is represented by the above graph? c. Active transport 2. Molecule X is most

More information

Chapter 3. Cellular Structure and Function Worksheets. 39 www.ck12.org

Chapter 3. Cellular Structure and Function Worksheets. 39 www.ck12.org Chapter 3 Cellular Structure and Function Worksheets (Opening image copyright by Sebastian Kaulitzki, 2010. Used under license from Shutterstock.com.) Lesson 3.1: Introduction to Cells Lesson 3.2: Cell

More information

MEMBRANE STRUCTURE AND FUNCTION

MEMBRANE STRUCTURE AND FUNCTION Chapter 5 The Working Cell: Membranes, Energy, and s Chapter 5: Big Ideas Cellular respiration Membrane Structure and Function Energy and the Cell How s Function MEMBRANE STRUCTURE AND FUNCTION Membranes

More information

7. A selectively permeable membrane only allows certain molecules to pass through.

7. A selectively permeable membrane only allows certain molecules to pass through. CHAPTER 2 GETTING IN & OUT OF CELLS PASSIVE TRANSPORT Cell membranes help organisms maintain homeostasis by controlling what substances may enter or leave cells. Some substances can cross the cell membrane

More information

Membrane Structure and Function

Membrane Structure and Function Membrane Structure and Function Part A Multiple Choice 1. The fluid mosaic model describes membranes as having A. a set of protein channels separated by phospholipids. B. a bilayer of phospholipids in

More information

BIO.2 a) water chemistry and its impact on life processes; b) the structure and function of macromolecules BIO.3 d) the cell membrane model

BIO.2 a) water chemistry and its impact on life processes; b) the structure and function of macromolecules BIO.3 d) the cell membrane model Membrane Transport Lesson Plan Topic: Membrane Structure and Passive Transport NSES: Content Standard A: Students will learn the abilities necessary to do and understand scientific inquiry SOLs: Date:

More information

Hillsborough Community College - Ybor City Campus 1025C Laboratory Exercise 5: Diffusion and Osmosis Introduction

Hillsborough Community College - Ybor City Campus 1025C Laboratory Exercise 5: Diffusion and Osmosis Introduction Functions of Cell Membranes 1. Protect cell, isolates cell interior from exterior Hillsborough Community College - Ybor City Campus 1025C Laboratory Exercise 5: Diffusion and Osmosis Introduction 2. Regulate

More information

water Passive transport moves solute from high to low concentration b) In active transport how do solutes move along their concentration gradient?

water Passive transport moves solute from high to low concentration b) In active transport how do solutes move along their concentration gradient? Membrane Transport Model 1: Active versus Passive Transport Body fluids are solutions of water and dissolved solutes (ions, glucose, amino acids, etc.). The plasma membrane is a selectively permeable barrier

More information

Keystone Study Guide Module A: Cells and Cell Processes

Keystone Study Guide Module A: Cells and Cell Processes Keystone Study Guide Module A: Cells and Cell Processes Topic 1: Biological Principles Cells and the Organization of Life Characteristics of Life all living things share the following characteristics:

More information

Cell Membrane Properties

Cell Membrane Properties Cell Membrane Properties Purpose of the lab: review the structure and function of the cell membrane understand the three types of transport across a membrane, and the special case of osmosis using Elodea

More information

24.7 Structure of Cell Membranes

24.7 Structure of Cell Membranes 24.7 Structure of Cell Membranes Phospholipids provide the basic structure of cell membranes, where they aggregate in a closed, sheet-like structure the lipid bilayer. The bilayer is formed by two parallel

More information

KEY. BI 212 Summer Exam I. July 27 th 2015

KEY. BI 212 Summer Exam I. July 27 th 2015 KEY BI 212 Summer 2015 Exam I July 27 th 2015 On your scantron, please fill in: 1. Your name (First and Last) 2. Exam I 3. Date 4. Lab section: MW at 1 section 010; MW at 4 section 011; TR at 1 section

More information

Homeostasis and Transport Module A Anchor 4

Homeostasis and Transport Module A Anchor 4 Homeostasis and Transport Module A Anchor 4 Key Concepts: - Buffers play an important role in maintaining homeostasis in organisms. - To maintain homeostasis, unicellular organisms grow, respond to the

More information

1. Define and give an example of the following:

1. Define and give an example of the following: Name: KEY Date: / / HR: Section 1 Chemistry of Life CHAPTER 3 CELL PROCESSES REVIEW 1. Define and give an example of the following: a. Atoms invisible particles that make up all mater; made from protons,

More information

BR #5. What part of the cell controls whether or not a virus or nutrient enters? a) Mitochondria b) Nucleus c) Plasma membrane d) Chloroplast

BR #5. What part of the cell controls whether or not a virus or nutrient enters? a) Mitochondria b) Nucleus c) Plasma membrane d) Chloroplast BR #5 What part of the cell controls whether or not a virus or nutrient enters? a) Mitochondria b) Nucleus c) Plasma membrane d) Chloroplast Schedule: Notes: Membrane physiology Microscope Lab Essentials

More information

The Discovery of the Cell

The Discovery of the Cell The Discovery of the Cell 7-1 Life Is Cellular Review the cell in relation to: - Its definition - The origin of life - The characteristics of life - The hierarchy of biological organization - The science

More information

Ions cannot cross membranes. Ions move through pores

Ions cannot cross membranes. Ions move through pores Ions cannot cross membranes Membranes are lipid bilayers Nonpolar tails Polar head Fig 3-1 Because of the charged nature of ions, they cannot cross a lipid bilayer. The ion and its cloud of polarized water

More information

Chapter Plasma Membrane Structure and Function 1. The plasma membrane is a phospholipid bilayer with embedded proteins. 2. Phospholipids have

Chapter Plasma Membrane Structure and Function 1. The plasma membrane is a phospholipid bilayer with embedded proteins. 2. Phospholipids have Chapter 5 5.1 Plasma Membrane Structure and Function 1. The plasma membrane is a phospholipid bilayer with embedded proteins. 2. Phospholipids have both hydrophilic and hydrophobic regions; nonpolar tails

More information

PSI Biology Membranes & Enzymes

PSI Biology Membranes & Enzymes Membranes Membranes, Diffusion Classwork 1. How does a phospholipid membrane create an isolated internal environment? 2. Draw and label a phospholipid. 3. In what way do the screen on a window and a cell

More information

Chapter 3: Structure and Function of the Cell

Chapter 3: Structure and Function of the Cell I. Functions of the Cell A. List and describe the main functions of the cell: 1. 2. 3. 4. 5. II. How We See Cells A. Light microscopes allow us to B. Electron microscopes are used to C. What type of electron

More information

The Structure and Function of Cells

The Structure and Function of Cells The Structure and Function of Cells The Cell is the basic functional unit of ALL living things. There are 2 basic types of cells: 1. Eukaryotic Cells = contain plasma membrane (cell membrane), organelles,

More information

Chapter 7: CELL MEMBRANE STRUCTURE AND FUNCTION

Chapter 7: CELL MEMBRANE STRUCTURE AND FUNCTION BIOLOGY I Chapter 7: CELL MEMBRANE STRUCTURE AND FUNCTION Evelyn I. Milian Instructor 2012 PLASMA MEMBRANE (Cell Membrane or Cytoplasmic Membrane) The plasma membrane is the cell s flexible outer limiting

More information

15.2. Objectives At the end of this lecture, you should be able to

15.2. Objectives At the end of this lecture, you should be able to Lecture 15: Molecular Structure of the Cell Membrane 15.1. Introduction Welcome to this lecture on molecular structure of the cell membrane. In this lecture, we are going to look at the molecules that

More information

Section 1 Workbook (unit 3) ANSWERS

Section 1 Workbook (unit 3) ANSWERS Section 1 Workbook (unit 3) ANSWERS Complete the following table: nucleotide DNA RN B1. Analyze the functional inter-relationships of cell structures. 1) Describe the function and structure of these organelles.

More information

Biological Membranes. Impermeable lipid bilayer membrane. Protein Channels and Pores

Biological Membranes. Impermeable lipid bilayer membrane. Protein Channels and Pores Biological Membranes Impermeable lipid bilayer membrane Protein Channels and Pores 1 Biological Membranes Are Barriers for Ions and Large Polar Molecules The Cell. A Molecular Approach. G.M. Cooper, R.E.

More information

CELLS NOT YOUR CELL PHONE PASSIVE TRANSPORT: LESSON 3 OVERVIEW. TEKS Pathophysiology

CELLS NOT YOUR CELL PHONE PASSIVE TRANSPORT: LESSON 3 OVERVIEW. TEKS Pathophysiology Lesson 3: Passive Transport CELLS NOT YOUR CELL PHONE PASSIVE TRANSPORT: LESSON 3 OVERVIEW Objectives: In this lesson the student will: 1. Define Passive Transport 2. Investigate what substances are moved

More information

SAM Teachers Guide Diffusion, Osmosis, and Active Transport

SAM Teachers Guide Diffusion, Osmosis, and Active Transport SAM Teachers Guide Diffusion, Osmosis, and Active Transport Overview Students investigate diffusion, osmosis, and active transport in order to study the movement of molecules into and out of cells. They

More information

Active Transport Moves solute Against Their Electrochemical Gradient

Active Transport Moves solute Against Their Electrochemical Gradient Active Transport Moves solute Against Their Electrochemical Gradient Active transport of solutes against their electrochemical gradient is essential to maintain the intracellular ionic composition of cells

More information

Basic Characteristics of Cells. Cell Structure and Function. Each Cell Has Three Primary Regions. Basic Characteristics of Cells. The Plasma Membrane

Basic Characteristics of Cells. Cell Structure and Function. Each Cell Has Three Primary Regions. Basic Characteristics of Cells. The Plasma Membrane Basic Characteristics of Cells Cell Structure and Function Chapter 3 Smallest living subdivision of the human body Diverse in structure and function Small Basic Characteristics of Cells Each Cell Has Three

More information

BIOLOGY 12 - Cell Membrane and Cell Wall Function: Chapter Notes

BIOLOGY 12 - Cell Membrane and Cell Wall Function: Chapter Notes BIOLOGY 12 - Cell Membrane and Cell Wall Function: Chapter Notes The cell membrane is the gateway into the cell, and must allow needed things such as nutrients into the cell without letting them escape.

More information

A. Membrane Functions

A. Membrane Functions A. Membrane Functions Biological Membranes are composed of Membrane Lipid Protein Myelin Sheath 80% 20% Plasma Membrane 50% 50% Mitochondrial 25% 75% Inner Membrane Fig. 5.12: Phospholipids Hydrophilic

More information

Cell Processes. Chapter Review

Cell Processes. Chapter Review Name Date Class Chapter Review Cell Processes Part A. Vocabulary Review Directions: Select the term from the following list that matches each description. active transport energy enzyme inorganic compound

More information

Membrane Structure, Transport, and Cell Junctions

Membrane Structure, Transport, and Cell Junctions Membrane Structure, Transport, and Cell Junctions 5 A model for the structure of aquaporin. This protein, found in the plasma membrane of many cell types, such as red blood cells and plant cells, forms

More information

Cell Transport across the cell membrane. Kathy Jardine and Brian Evans. July 17, 2014

Cell Transport across the cell membrane. Kathy Jardine and Brian Evans. July 17, 2014 Cell Transport across the cell membrane Kathy Jardine and Brian Evans July 17, 2014 INFORMATION ABOUT THE LESSON Grade Level and Subject Area 10 (9-11): Biology Time Frame 4-45 min class periods Objectives:

More information

Anatomy and Physiology Placement Exam 2 Practice with Answers at End!

Anatomy and Physiology Placement Exam 2 Practice with Answers at End! Anatomy and Physiology Placement Exam 2 Practice with Answers at End! General Chemical Principles 1. bonds are characterized by the sharing of electrons between the participating atoms. a. hydrogen b.

More information