Glucose Fructose Galactose
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1 Name Date Per preap Biology Nutrient Molecules: Chemistry and Identification of Carbohydrates Today, scientists use a combination of biology and chemistry for their understanding of life and life processes. Thus, an understanding of some chemistry of living things is necessary. In this activity, you will construct models that represent three major molecules of biology. Remember: Models do not represent the actual three-dimensional shapes of the molecules. Models serve to help you learn how smaller molecules can be grouped into larger, more complex molecules. Procedure Part A. Water Model 1. What is the molecular formula for water? 2. What elements make up water? 3. How many Hydrogen atoms are present in a molecule of water? 4. How many Oxygen atoms are present in a molecule of water? Part B. Carbohydrate Models Group 1. Monosaccharide (single molecule sugars) A single molecule sugar is called a monosaccharide. The prefix mono means one. However, the one molecule can have different shapes due to a different arrangement of atoms. Three monosaccharides are glucose, fructose, and galactose. Glucose Fructose Galactose Examine the structural formulas of these three sugars SHOWN ABOVE and answer questions 1 to What three chemical elements are present in all three monosaccharides shown? 2. How many atoms of carbon are present in a molecule of Glucose Fructose Galactose 3. Add subscripts to the following to indicate the proper molecular formula. Fill in the blanks by counting the total number of carbon, hydrogen, and oxygen atoms in each molecule. Glucose: C H O Fructose: C H O Galactose: C H O 1
2 4. What is the ratio of hydrogen atoms to oxygen atoms in a monosaccharide? 5. What is the ratio of hydrogen atoms to oxygen atoms in a molecule of water? 6. Compare the structural formula of glucose and fructose a. Are they exactly the same in shape? b. Are they both monosaccharides? Group 2. Disaccharides (double molecule sugars) Two monosaccharide sugar molecules can join chemically to form a larger carbohydrate molecule called a double sugar, or disaccharide. The prefix di- means two. By chemically joining a glucose molecule with a fructose molecule, a double sugar called sucrose is produced. Use the page of paper models given to you by your teacher to complete this section. Sucrose Cut out a model of ONE glucose and ONE fructose molecule. Cut along SOLID LINES ONLY. In order to join the molecules, remove an OH end from ONE molecule and an H end from THE OTHER molecule. Cut along the dotted lines. Fit the fructose and glucose together. Glue on the space below and label the molecule sucrose. 7. The H and OH ends that were removed can also fit together with each other to form a molecule. This new molecule has a molecular formula of and is called. Fit together and glue the H and OH next to the sucrose and label it. 2
3 8. Write the molecular formula for sucrose by adding together the molecular formulas of glucose and fructose FROM QUESTION #3 and then subtracting water, H 2 O Molecular Formula for Glucose + Molecular Formula for Fructose = - H 2 O Molecular Formula for Sucrose = Maltose Different disaccharide molecules can be made by joining other monosaccharides in different combinations. By chemically joining a glucose molecule to another glucose molecule, a double sugar called maltose is formed. Cut out two molecules of glucose. Cut along SOLID LINES ONLY. 9. What must be removed from the glucose models so that they easily fit together? Remove the necessary pieces for the two glucose models to fit together. Fit together the two glucose molecules and glue on the space below. Label the molecule maltose. Fit together and glue the H and OH next to the maltose and label it. 3
4 10. Write the molecular formula for maltose using the molecular formulas FROM QUESTION #3. Molecular Formula for Glucose + Molecular Formula for Glucose = - H 2 O Molecular Formula for Maltose = 11. How does the molecular formula for sucrose compare to maltose? 12. What is the ratio of hydrogen atoms to oxygen atoms in a disaccharide? 13. How many monosaccharide molecules are needed to form one sucrose molecule? 14. How many monosaccharide molecules are needed to form one maltose molecule? Group 3. Polysaccharides (many molecule sugars) Just as double sugars were formed from two single sugar molecules, polysaccharides are formed when many single sugars are joined chemically. The prefix poly- means many. Starch, glycogen, and cellulose are the three most common polysaccharides in biology. They consist of long chains of glucose molecules joined together. Construct a starch molecule by joining three glucose molecules. This model will represent only a small part of a starch molecule because starch consists of hundreds of glucose molecules. 15. What must be removed from the glucose models in order to have them easily fit together? Fit together and glue the glucose molecules in the space below. Label the molecule starch. Fit together and glue each of the two water molecules next to the starch molecule and label them. 4
5 5
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