practice_midterm_key - Chem 237 term test#1 version 001...

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Chem 237 term test #1 version 001 October 14 th , 2009 1. The three-dimensional structure of macromolecules is formed and maintained primarily through noncovalent interactions. Which one of the following is not a noncovalent interaction? A) disulfide bonds B) hydrogen bonds C) hydrophobic interactions D) ionic interactions E) van der Waals interactions 2. The four covalent bonds in methane (CH 4 ) are arranged around carbon to give which one of the following geometries? 3. The enzyme trypsin catalyzes the cleavage of polymers of L amino acid but it will not catalyze the cleavage of polymers of D amino acids. This is an example of which of the following? 4. The standard free energy change Gº for a reaction is -46.11 kJ/mol. Which of the following statements is always true? Page 1 of 9
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Chem 237 term test #1 version 001 October 14 th , 2009 5. 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. The phosphorylation of glucose, the first step in its metabolism is energetically unfavorable. How, then, do all cells accomplish this process?
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