153A_Exam2_S10_answers

153A_Exam2_S10_answers - Chem 153A, Spring 2010 Exam 2...

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1. (5) a, c, d, f, g 2. (2) c, a, b 3. (4 pts) (1) b; (2) c; (3) a; (4) d 4. (3) A β-barrel is like a β-sheet rolled up so t edges H-bond. If there are an odd number o strands, two bonded strands will be parallel (see edge strands in pic), and the barrel is no wholly antiparallel. 5. (2) False – cholesterol clusters in rafts 6. (2) False – [S] is constant because [S] >> [E 7. (2) True 8. (2) True 9. a. (3) g G pO 2 ± ²³ ´pO 2 gµ¶ ·¸ ¹ pO 2 º G pO 2 g » ¶ ·¸ ¹ g » pO 2 G pO 2 g » ¶ ·¸ G pO 2 ¼ g » pO 2 g » ¶ ·¸ G pO 2 µ1 ¼ gº ·¸ G pO 2 µ1 ¼ gº g G 44 torr » 0.1 0.9 G 4 b. (4) x-axis: pO 2 (torr); y-axis: θ, with va ‘N’ curve: hyperbolic, passing through approaching 1.0 in y; ‘A’ curve (right o hyperbolic, passing through (4.9, 0.5) a c. (2) lower d. (3) Affinity depends on the rate constan and unbinding. To have a lower affinit unbind (dissociate) faster from the alter 10. a. (2) hydrolase, phosphatase b. (2) ligase, synthetase c. (1) isomerase
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