Question 1 (2 points): Which one of the following state ments does NOT correctly

Question

Question 1 (2 points): Which one of the following state ments does NOT correctly describe an enzyme? A. Can be a protein or RNA molecule B. Decreases the free energy difference (AG) between substrate(s) and product(s) ermanently altered D. Lowers the activation energy barrier for initiating a reaction E. Interacts more favorably with substrate in the transition state than the ground state Question 2 (2 points): Which one of the following statements best describes general acid-base catalysis? A. A nucleophile attacks the carbon of a carbonyl group. B. A metal ion orients a substrate for reaction or stabilizes a charged transition state. C. A proton (H') transfer is mediated by water. D. Charge-charge interactions occur in the transition state. E. A proton (H) transfer is mediated by a weak acid or base other than water. Question 3 (2 points): An allosteric regulator of an enzyme: A. Binds reversibly to a site different from the substrate-binding site. B. Binds reversibly to the substrate-binding site. C. Covalently modifies an amino acid residue in the active site. D. Covalently modifies an amino acid residue outside the active site. E. Irreversibly modifies the enzyme by cleaving its polypeptide chain.

Explanation / Answer

Q1.B.Decreases the free energy difference between substrates and reactants

enzymes only lower activation energy, but do not change the difference in energy levels between reactants and products.

Q2.

E. A proton(H+) transfer is mediated by a weak acid or base other than water

Q3.

A.binds reversibly to a site different from the substrate-binding site

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