9. In the Beer-Lambert equation, A = abc, what quantity is represented by "ε"?
(A) Absorptivity
(B) Molar absorptivity
(C) Path length
(D) None of these

10. Sucrose consists of (A) Glucose + glucose (B) Glucose + fructose (C) Glucose + galactose (D) Glucose + mannose

11. Which of the following segments of the integral membrane protein glycophorin most likely contains the membrane-spanning sequence? (A) LSTTEVAMHTTTSSSVSKSY (B) SQTNDTHKRDTYAATPRA (C) VSEISVRTVYPPEEETGE (D) ITLIIFGVMAGVIGTILLI (E) YGIRRLIKKSPSDVKPLP.

12. The cleavage specificity of trypsin and chymotrypsin depend in part on the (A) proximity of Ser 195 to the active site or specificity pocket (B) size, shape, and charge of the active site or specificity pocket (C) presence of a low-barrier hydrogen bond in the active site or specificity pocket (D) absence of water in the active site.

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.

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