13. The first step in the zymogen activation of chymotrypsinogen is
(A) binding of trypsinogen activator
(B) cleavage by trypsin
(C) folding into the native structure
(D) self-digestion by chymotrypsin

14. Movement of ions across a cell membrane by the Na/K ATPase is best described as (A) sodium moved outside to inside, potassium inside to outside (B) sodium moved inside to outside, potassium outside to inside (C) sodium moved inside to outside, potassium inside to outside (D) sodium moved outside to inside, potassium outside to inside (E) none of the above

15. The peptide bond in proteins is (A) planar, but rotates to three preferred dihedral angles (B) nonpolar, but rotates to three preferred dihedral angles (C) nonpolar, and fixed in a trans conformation (D) planar, and usually found in a trans conformation

16. Which of the statements regarding enzymes is false? (A) Enzymes are proteins that function as catalysts. (B) Enzymes are specific. (C) Enzymes provide activation energy for reactions. (D) Enzyme activity can be regulated. (E) Enzymes may be used many times for a specific reaction

17. Which of the following is TRUE regarding cofactors? (A) Coenzymes are often separate from the enzyme and do not need recharged. (B) Metal ions must be covalently attached to function as a cofactor. (C) Cofactor is a broad term used for all enzyme "helpers". (D) Prosthetic groups can dissociate readily and be regenerated for use in another enzyme. (E) An apoenzyme implies that a cofactor is present.

18. Which of the following compounds would cross a biological membrane most readily by nonmediated diffusion? (A) water (B) acetone (C) hexane (D) acetic acid (E) methanol

19. The quaternary structure of human hemoglobin is best described as a (A) dimer of two myoglobin dimers. (B) tetramer of identical subunits. (C) tetramer of four different subunits. (D) tetramer of two different subunits.

20. The steady state assumption in enzyme kinetics: (A) insures that the product of an enzymatic reaction will always be formed (B) explains why enzymes are effective catalysts (C) states that the formation of ES is equal to its breakdown (D) is based upon the fact that the maximum velocity of an enzyme is very high (E) none of the above

21. In the following enzyme reaction scheme, what sort of multi-enzyme kinetics are shown? (A) ordered substrate binding with random product release (B) ordered substrate binding with ordered product release (C) random substrate binding with ordered product release (D) random substrate binding with random product release (E) ping-pong mechanism

22. A peptide was found to have a molecular mass of about 650 and upon hydrolysis produced Ala, Cys, Lys, Phe, and Val in a 1:1:1:1:1 ratio. The peptide upon treatment with Sanger's reagent produced DNP-Cys and exposure to carboxypeptidase produced valine. Chymotrypsin treatment of the peptide produced a dipeptide that contained sulfur and has a UV absorbance, and a tripeptide. Exposure of the peptide to trypsin produced a dipeptide and a tripeptide. Deduce the sequence of the peptide. (A) Val-Ala-Lys-Phe-Cys (B) Cys-Lys-Phe-Ala-Val (C) Cys-Ala-Lys-Phe-Val (D) Cys-Phe-Lys-Ala-Val (E) Val-Phe-Lys-Ala-Cys

23. What type of inhibitor would give the results seen in the following plot? (A) competitive inhibitor (B) mixed inhibitor (C) noncompetitive inhibitor (D) uncompetitive inhibitor (E) none of the above

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