Question

12) Which of the following types of enzyme carries out phosphorylation of a protein?

(a) isomerase

(b) kinase

(c) phosphodiesterase

(d) lyase

(e) hydrolase

13) Flavin adenine nucleotide is a coenzyme for which of the following?

(a) monoamine oxidase

(b) trypsin

(c) chymotrypsin

(d) Na⁺ K⁺ ATPase

(e) all of the above

14)   A noncompetitive inhibitor

(a) binds only to [ES]

(b) binds either [E] or [ES]

(c) binds only to [E]

(d) binds only to [S]

(15) Which of the following is least likely to be found covalently attached in an amino acid building block used for   proteins?

1. sulfur
2. an extra amino group
3. an extra carboxylic acid group
4. chlorine
5. all of the above

(16) Which of the following groups of amino acids all have aromatic R groups?

1. F, A and G
2. I, H and Y
3. Y, W and F
4. V, H and W
5. All of the above

(17) Which of the following amino acids are all basic in a solution of pH 7.0?

1. lys and asn
2. lys and arg
3. asn and gln
4. lys and gln
5. val and ser

(18) alpha helix is abundant in which of the following

1. hemoglobin only
2. alpha actinin only
3. keratin only
4. all of the above proteins
5. none of the above proteins

19) A prosthetic group is ?

(a) a repair enzyme

(b) a non-amino acid group that is part of an enzyme

(c) a particular amino acid that is part of an enzyme

(d) a group that generates the native form of a protein

(e) a group that reduces enzyme activity

20) Which level of protein structure is most important in the positioning of an enzyme’s active site residues for substrate binding?

(a) primary structure

(b) secondary structure

(c) tertiary structure

(d) quatenary structure

21) Which of the following is true for the effects of a competitive inhibitor on an enzyme?

1. both Km and Vm are decreased

(b) Km is increased and Vm stays the same

(c) Km stays the same and Vm is increased

(d) Km stays the same and Vm is decreased

(e) Km and Vm are increased

Answer 1

12. b) Kinase

13. a) monoamine oxidase

14. b) binds either [E] or [ES].

15. e) all of the above.

16. e) all of the above.

17. b) lys and arg

18. a) hemoglobin only.

19. b) a non amino acid group that is part of an enzyme.

20. a) primary structure.

21. d) Km is increased and Vm stays the same.