17. What kind of protein secondary structure is spider silk made of?
(A) α-helix
(B) β-sheet
(C) β-turns
(D) Random coils

18. What proteins are involved in protein folding? (A) Ribonuclease A (B) Myoglobulin (C) Chaperonins and Chaperone proteins (D) None of the above

19. Which protein denaturant can unfold a protein reversibly? (A) Acid or alkaline (B) Organic solvent (C) Urea or guanidinium (D) All of the above

20. What forces drive the formation of protein tertiary structure? (A) Hydrophobic interaction (B) Electrostatic interaction (C) H-bonds (D) All of the above

21. Which statement regarding to enzymes below is incorrect? (A) Most enzymes are proteins. (B) Enzymes favor the formation of products. (C) Enzymes catalyze the reactions by lowering the activation energy. (D) A and C

22. Which statement about enzymes below is correct? (A) An enzyme has specificity toward its substrates. (B) An enzyme binds to the substrate better than the product. (C) Enzymes have active sites that bind to products poorly. (D) All of the above.

23. An enzyme will have higher affinity for which one of the following? (A) The substrate (B)The reaction intermediate (C) The product (D) None of the above

24. How does an enzyme lower the reaction activation energy? (A) By lowering the entropy (B) By binding to the substrate firmly (C) By providing an active site that best fits the reaction intermediate (D) By desolvation of the substrate

25. Regarding to inhibition mechanisms, which statement below is correct? (A) If the inhibitor binds to the active site, it is a competitive inhibitor. (B) If the inhibitor binds to the enzyme/substrate complex only, it is an uncompetitive inhibitor. (C) If the inhibitor binds to the free enzyme as well as the enzyme/substrate complex, it is a noncompetitive inhibitor. (D) All of the above.

26. With an enzyme following Michaelis behavior, what initial velocity would you expect, when the substrate concentration is twice that of its Km? (A) 0.5 Vmax (B) 0.667 Vmax (C) 0.75 Vmax (D) 0.9 Vmax

27. If an enzyme has a Vmax of 10 unit and its Km is 8 mM, how fast can the enzyme catalyze the reaction if the substrate concentration is 4 mM? (A) 2 unit (B) 3.33 unit (C) 5 unit (D) 6.67 unit

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