3150:112 SAMPLE TEST 2. Print out a copy Answer the questions on your own. Check the answers at GOBC Ans.pdf. Good Luck!

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1 SAMPLE TEST :112 Print out a copy Answer the questions on your own. Check the answers at GOBC Ans.pdf. Good Luck! QUESTIONS 1-3 REFER TO TE FOLLOWING: A. C 2 O O B. C 2 O O O C 2 O C. O C 2 O 1. Which are broken down by hydrolysis with dilute acid? a) A and C only. c) A, B, and D only. d) All are. e) None is. D. C 2 C O 2 O O O O C 2 2. Which contain a glycosidic bond? a) All do. b) A and C only. c) A, B, and C only. d) B and D only. 3. Which are reducing sugars? a) A and C only. b) None is. c) D only. d) A, B, and C only. e) All are.

2 2 4. Consider the following: CO CO O O C 2 C 2 ow are these structures related? a) They are cis-trans isomers. b) They are the same molecule drawn two different ways. c) They are mirror-image stereoisomers. d) They are both ketoses. 5. The major storage polysaccharide in humans is a) Cellulose. b) Cellulite. c) Glucose. d) Glycogen. e) Starch. 6. The structural feature(s) common to all membrane lipids is/are a) A non-polar tail derived from fatty acids, and a polar head containing phosphate and amine or carbohydrate. b) A 4-ring carbon skeleton called the steroid nucleus. c) A polar tail derived from fatty acid, and a non-polar head containing phosphate and amine or carbohydrate. d) A structure derived from arachidonic acid. 7. At physiological p, the side chains of acidic and basic amino acids are a) Not ionized ( CO, N 2 ). b) In their basic forms only ( COO, N 2 ). c) In their acidic forms only ( CO, N + 3 ). d) Ionized ( COO, N + 3 ). 8. Consider the following peptides: Tyr Gly Gly Phe Met Val Val Met Phe Gly Gly Tyr You would predict that the biological activity of the peptides a) Would be different, since they have different quaternary structures. b) Would be the same, since the second peptide is the first peptide written in reverse. c) Would be different, since they have different primary structures. d) Would be the same, since they contain the same amino acid residues.

3 3 9. Which of the following represents primary protein structure? a) A only. c) C only. d) B, C, and E only. e) None of these. A. β-pleated sheet B. Salt bridge C. Combined protein subunits D. Disulfide bridge E. ydrophobic interaction 10. Consider the following biological functions: A. Transport B. Aqueous media storage C. Process regulation D. Energy source E. Catalysis Which are not primarily protein functions? a) A, C, and D only. c) A, C, and E only. d) C, D, and E only. e) All are primary protein functions. 11. Amines are bases because a) They produce hydroxide ( ) ions, which can react with +. b) They are often quite soluble in water. c) The N bond can form hydrogen bonds in solution. d) Amines react with + to produce N + bonds. 12. Which of the following is most likely to be water-soluble? C 2 C 3 A. N C 2 C 3 B. N C 2 C 3 a) A. b) B. c) C. C. C 3 Br N + C 3 C 3

4 4 13. Plant-derived, heterocyclic amines that are often physiologically active are called a) Alkalis. b) Al. c) Alkaloids. d) Aldehydes. 14. Most drugs containing amine groups are administered as amine (ammonium) salts. This is because a) The environment of the stomach is alkaline. b) Ammonium salts dissolve in body fluids. c) Ammonium salts dissolve in lipids. 15. In animals, carbohydrates serve principally as a) Structural molecules. b) Chemical messengers. c) Sources of energy. 16. A β-pleated sheet is held together by a) Salt bridges (ionic bonds). b) Disulfide bridges. c) Sheer willpower. d) ydrogen bonds. 17. Destruction or disruption of the secondary or higher-order structure of a protein is called a) ydrolysis. b) Dehydration. c) Inhibition. d) Denaturation. 18. The chemical group attached to a conjugated protein that provides the protein's function is the a) Backbone. b) Prosthetic group. c) Side chain d) C-terminal group. 19. Fibrous proteins such as collagen are generally characterized by a) Solubility in water and mechanical strength. b) Insolubility in water and a globular, 3-dimensional structure. c) Solubility in water and a globular, 3-dimensional structure. d) Insolubility in water and mechanical strength.

5 5 20. Consider the following changes in the environment of a protein: A. Mechanical agitation B. Addition of a polar organic solvent C. Addition of a heavy metal ion Which would most likely lead to the disruption of hydrophobic interactions? a) A only. b) B only. c) C only. d) B and C. e) A and B. 21. What is the most important difference between fats and oils? a) Fats are primarily the esters of unsaturated fatty acids. b) Oils are primarily the esters of saturated fatty acids. c) Oils are liquid triglycerides, fats are solid triglycerides. 22. Some fatty acids are essential because a) They must be supplied in the diet. b) The body synthesizes them from other nutrients. c) The body uses them more efficiently. d) They are found in important organs, such as the brain. 23. The basic structural element of a cell membrane is a a) Micelle. b) Lipid bilayer. c) Solution. d) Lipoprotein. 24. The common physical property of all lipids is a) Extreme water solubility. b) The ability to form micelles. c) igher density than water. d) Insolubility in water. 25. ormones are a) Things to avoid after the age of 13. b) Chemical messengers. c) Aqueous media storage molecules. d) Energy storage molecules.