45. Which of the following is true of enzymes? a) delta G of catalyzed reaction

Question

45. Which of the following is true of enzymes? a) delta G of catalyzed reaction "A" is lower than that of the same reaction "A The that is not catalyzed. b) Enzymes can increase the activation energy of exergonic reactions. c) An enzyme can overcome competitive inhibition of its reaction if the substrate concentration is increased. d) A change to the normal tertiary structure of an enzyme likely makes that enzyme e) None of the above more efficient. 46. Which of the following statements regarding protein structure is truE? ehere are no examples of denatured proteins regaining their orieinal structure, in the lab. b) c) d) Any mutation in a gene (DNA) that codes for a protein will result in a change in the overall structure of the protein. There are hydrophobic interactions that help to determine the primary and secondary structure of some proteins. All proteins have some sort of quaternary structure- even if it is minimal. There are hydrogen bonds in the secondary, tertiary and quaternary structure of some proteins. e) 47. Which of the following statements about proteins and amino acids is false? The R-groups (side chains) of amino acids determine whether it is classified as polar or nonpolar Two amino acids can be linked to one another through a dehydration reaction. The amino acids of proteins can only bond with other amino acids; no other macromolecules can form a bond with them. Changing a single amino acid in a protein's primary structure could wipe out its function None of the above a) b) c) d) e) 48. An exer rgonic enzymatic reaction in a test tube is not forming any product despite the enzyme being present. All the following are reasonable explanations for that occurrence EXCEPT: a) The pH of the test tube is too low. b) There is no ATP in the test tube. c) The temperature is not optimal. d) The enzyme's co-activators are missing from the test tube. e) There are no exceptions listed above 14

Explanation / Answer

45- Option c , substrate concentration increase reverses the competetive inhibhition.

46- Option b

47- Opyion c , they can bind with other macromolecules like glucose.

48- Option B

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