Name: Class: Date: Chapter 7 Quiz -7. Which of the following is true about salic

Question

Name: Class: Date: Chapter 7 Quiz -7. Which of the following is true about salicylate? a. it is a natural compound from the bark of a tree b. it is structurally similar to aspirin e. it stimulates the protein kinase, AMPK d. it has therapeutic effects in lowering the risk of heart disease e. all of these _ 8. Homotrophic effects for allosteric enzymes involve a. the same molecule binding to different sites in the enzyme b. different molecules binding to the same site in an enzyme e. different molecules binding to different sites in the same enzyme. d. All of these are homotrophic effects. n is between 9. The initial bond formation in the covalent intermediate in the reaction catalyzed by chymotrypsin is a. serine and the carbonyl carbon in the peptide backbone b. serine and the nitrogen in the peptide backbone c. histidine and the carbonyl carbon in the peptide backbone d. histidine and the nitrogen in the peptide backbone 10. An important step in elucidating the behavior of an enzyme is a. obtaining a crystalline sample of the enzyme. ng that metal ions are always excluded from the enzyme sample. c. determining the active site residues. d. none of these I l. B vitamins are often stored in the body. a. True b. False 12. The binding of aspartate to different subunits of ATCase is an example of a. enzyme inhibition b. a heterotropic effect c. a homotropic effect d. negative cooperativity e. none of these 13. What happens when a K-acting inhibitor is added to an allosteric enzyme system? a. The apparent Ky for the substrate increases. b. The apparent Kst for the substrate decreases. c. The apparent Vas for the substrate increases. d. The apparent Vman for the substrate decreases.

Explanation / Answer

7) e

8) a ( homotropic effects means same molecule binding to differents sites of enzymes)

9) a

10) c ( determing the active site of the residues)

11) b (water soluble vitamins cannot be stored in body for long time)

12) c ( in case of homotropic effects a molecule is bind to different subunits)

13) a (the apparent Km for substrate increases)

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