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Unformatted text preview: MCDB 1A Summer 2006 Name 1. Two carbon atoms held together in a double covalent bond share ______ electrons(s)? A) one B) two C) four D) six E) eight 2. Polar molecules A) have an overall negative electric charge. B) have an equal distribution of electric charge. C) have an overall positive electric charge. D) have an unequal distribution of electric charge. E) are ions. 3. Sulfur is commonly found in the cysteine residues of proteins. This atom typically functions by A) hydrogen bonding with other atoms in beta-sheets. B) forming ionic bonds with other amino acids. C) contributing to Vander walls forces that stabilize tertiary structure. D) forming disulfide bridges that support tertiary structure. E) All of the above are true. 4. The tails of phospholipids are composed of hydrocarbon chains. These chains are _______ and are located on the _______ surface of the lipid bilayer. A) hydrophobic; interior B) hydrophobic; exterior C) hydrophilic; interior D) hydrophilic; exterior E) None of the above 5. A fat contains fatty acids and A) glycerol. B) a base. C) an amino acid. D) a phosphate. E) None of the above. 6. Polysaccharides, polypeptides, and polynucleotides all A) contain simple sugars. B) are formed in condensation reactions. C) are found in cell membranes. D) contain nitrogen. E) contain sulfur. 7. A molecule that is important in the storage of energy is A) a steroid. B) RNA. C) glycogen. D) an amino acid. E) hexose. 8. The side chain of leucine is a hydrocarbon. In a folded protein, where might you find leucine? A) In the interior of a cytoplasmic enzyme. B) On the exterior of a protein embedded in a membrane. C) On the exterior of a cytoplasmic enzyme. D) Both A and B E) Both A and C 9. Cholesterol is soluble in ether, an organic solvent, but it is not soluble in water. Based on this information, what class of biological macromolecules does cholesterol belong to? A) Nucleic Acids B) Carbohydrates C) Proteins D) Enzymes E) Lipids 10. Which of the following functional groups would be a proton acceptor at physiological pH (7.4)? A) An amine. B) A carboxylic acid. C) An aldehyde. D) A keto. E) A hydroxyl. 11. Which of the following statements regarding DNA and RNA is NOT true A) DNA incorporates thymine, whereas RNA utilizes uracil. B) DNA is double-stranded, whereas RNA is typically single-stranded. C) DNA uses a deoxyribose sugar, while RNA uses a ribose sugar. D) DNA is spliced, whereas RNA is typically more stable. E) RNA can function as a catalyst and is found in the ribosome. 12. Starch, glycogen and cellulose share all of the following except A) the same number of carbon atoms. B) glucose monomers. C) the same glycosidic bonds. D) C, H and O atoms....
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- Fall '08