36184672-Practice-Test-1

36184672-Practice-Test-1 - Chapter 1 The Foundations of...

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Chapter 1 The Foundations of Biochemistry Multiple Choice Questions 1. Chemical foundations Page: 14 Difficulty: 1 Ans: B What functional groups are present on this molecule? A) ether and aldehyde B) hydroxyl and aldehyde C) hydroxyl and carboxylic acid D) hydroxyl and ester E) hydroxyl and ketone 2. Chemical foundations Page: 17 Difficulty: 1 Ans: D Stereoisomers that are nonsuperimposable mirror images of each other are known as: A) anomers. B) cis-trans isomers. C) diastereoisomers. D) enantiomers. E) geometric isomers. 3. Physical foundations Page: 23 Difficulty: 1 Ans: C If heat energy is absorbed by the system during a chemical reaction, the reaction is said to be: A) at equilibrium. B) endergonic. C) endothermic. D) exergonic. E) exothermic. 4. Physical foundations Page: 23 Difficulty: 2 Ans: D If the free energy change G for a reaction is -46.11 kJ/mol, the reaction is: A) at equilibrium. B) endergonic. C) endothermic. D) exergonic. E) exothermic. 5. Physical foundations Page: 26 Difficulty: 2 Ans: A
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Chapter 1 The Foundations of Biochemistry Enzymes are biological catalysts that enhance the rate of a reaction by: A) decreasing the activation energy. B) decreasing the amount of free energy released. C) increasing the activation energy. D) increasing the amount of free energy released. E) increasing the energy of the transition state. 6. Physical foundations Page: 27 Difficulty: 1 Ans: B Energy requiring metabolic pathways that yield complex molecules from simpler precursors are: A) amphibolic. B) anabolic. C) autotrophic. D) catabolic. E) heterotrophic. 7. Genetic foundations Page: 30 Difficulty: 2 Ans: E The three-dimensional structure of a protein is determined primarily by: A) electrostatic guidance from nucleic acid structure. B) how many amino acids are in the protein. C) hydrophobic interaction with lipids that provide a folding framework. D) modification during interactions with ribosomes. E) the sequence of amino acids in the protein. Short Answer Questions 8. Cellular foundations Page: 11 Difficulty: 2 (a) List the types of noncovalent interactions that are important in providing stability to the three- dimensional structures of macromolecules. (b) Why is it important that these interactions be noncovalent, rather than covalent, bonds? Ans: (a) Noncovalent interactions include hydrogen bonds, ionic interactions between charged groups, van der Waals interactions, and hydrophobic interactions. (b) Because noncovalent interactions are weak, they can form, break, and re-form more rapidly and with less energy input than can covalent bonds. This is important to maintain the flexibility needed in macromolecules. 9. Chemical Foundations Pages: 17-18 Difficulty: 2 Why is an asymmetric carbon atom called a chiral center? Ans:
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This note was uploaded on 12/15/2010 for the course BIO 2045L taught by Professor None during the Spring '10 term at University of Florida.

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36184672-Practice-Test-1 - Chapter 1 The Foundations of...

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