Get It Right. Answers. Chapter 1: The Science of Life. A biologist studies all living things.

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1 Discover Biology 'N' Level Science Chapter 1 Chapter 1: The Science of Life A biologist studies all living things. In order to carry out the scientific method, we need to ask questions.

2 Discover Biology 'N' Level Science Chapter 2 Chapter 2: Cells An animal cell does not have cellulose cell wall. Red blood cells transports oxygen.

3 Discover Biology 'N' Level Science Chapter 3 Chapter 3: Movement of Substances Osmosis is the movement of water molecules across a partially permeable membrane from a solution of higher water potential to as solution of lower water potential. The larger the surface area to volume ration, the faster the rate at which oxygen enters the cell.

4 Discover Biology 'N' Level Science Chapter 4 Chapter 4: Nutrients (e) Nutrients include carbohydrates, fats and proteins. Maltose, lactose and sucrose are double sugars. A fat molecule is made up of three fatty acid molecules joined to one molecule of glycerol. Proteins give a violet colour when tested with the biuret test.

5 Discover Biology 'N' Level Science Chapter 5 Chapter 5: Enzymes In the lock-and-key hypothesis, the substrate fits into the enzyme, just like a key fits into a lock. Enzymes are most active at optimum temperature. Enzymes are most active at optimum

6 Discover Biology 'N' Level Science Chapter 6 Chapter 6: Nutrition in Humans (e) The large intestine consists of the colon and the rectum. Water and mineral salts are absorbed in the small intestine and the colon. The hepatic portal vein transports glucose from the small intestine to the liver.

7 Discover Biology 'N' Level Science Chapter 7 Chapter 7: Nutrition in Plants (e) Photosynthesis requires light, chlorophyll, carbon dioxide and water. Photosynthesis releases oxygen gas. In photosynthesis, glucose is formed from carbon dioxide and water.

8 Discover Biology 'N' Level Science Chapter 8 Chapter 8: Transport in Humans (e) Red blood cell transports oxygen around the body. White blood cells/ phagocytes engulfs foreign bodies such as bacteria. The hepatic artery brings oxygenated blood to the liver.

9 Discover Biology 'N' Level Science Chapter 9 Chapter 9: Transport in Plants (e) Phloem translocates manufactured food substances. Xylem vessels provide support to the plant organs. Roots absorb ions and mineral salts mainly by active transport.

10 Discover Biology 'N' Level Science Chapter 10 Chapter 10: Respiration in Humans In anaerobic respiration in humans, no carbon dioxide is released. Anaerobic respiration occurs in human muscles when muscular contractions are so vigorous that maximum aerobic respiration is unable to release energy fast enough to meet the demand.

11 Discover Biology 'N' Level Science Chapter 11 Chapter 11: Reproduction in Plants The nucleus in the pollen grain is the male gamete. Offspring produced by self-pollination method are genetically dissimilar

12 Discover Biology 'N' Level Science Chapter 12 Chapter 12: Reproduction in Humans Sperm and urine passes out of the body through the urethra. Ovulation occurs on day 14 in a 28-day menstrual cycle.

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