8. The plasma membrane is responsible for all EXCEPT:
(A) energy transduction
(B) exclusion of certain toxic ions and molecules
(C) signal transduction
(D) accumulation of cell nutrients
(E) all are true.

9. Lipid bilayers differ from micelles in that micelles are: (A) self limiting structures (B) formed spontaneously (C) stable in aqueous solution (D) often transformed into vesicles (E) all are true.

複選題10. Which of the following would be the most likely interaction between a peripheral membrane protein that contained a high lysine content and a membrane? (A) ionic interaction (B) hydrophobic interaction (C) hydrogen bonding (D) covalent bonding (E) both a and c.

11. The structure is that of? (A) sphingomyelin (B) platelet activating factor (PAF) (C) phosphatidylcholine (D) a cerebroside (E) phosphatidylethanolamine. 

12. Urea contains one carbon, two nitrogens, one oxygen and 4 hydrogens. Where are the sources of the carbone and nitrogens? (A) carbamoyl phosphate and ornithine (B) bicarbonate and aspartate (C) carbamoyl phosphate and bicarbonate and ornithine (D) aspartate (E) None of the above.

13. Which of the following enzymes is responsible for the release of arachidonic acid from membrane phospholipids? (A) phospholipase A1 (B) phospholipase A2 (C) phospholipase B (D) phospholipase C (E) phospholipase D.

14. Which of the following sugars is an aldopentose? (A) galactose (B) ribulose (C) ribose (D) xylulose (E) mannose.

15. Which one is of thermodynamics property and which one is kinetics relevant? (A) I is thermodynamics property and II is kinetics relevant, (B) II is thermodynamics property and I is kinetics relevant, (C) Both are kinetics relevant, (D) The answer will depend on the temperature. 

16. Which of the following is true regarding the Briggs and Haldane steady state assumption? (A) It is defined by the equation E + S = ES = E + P, (B) It states the rate of enzyme-substrate complex formation differs from the rate of enzyme-substrate disappearance, (C) The concentration of the enzyme-substrate complex reaches a constant value even in a dynamic system, (D) The enzyme-substrate complex will always dissociate to form E + P, (E) The total amount of enzyme is variable, depending on the amount of substrate available.

17. Because the enzymatic reaction rate is determined by the difference in energy between ES and , the tighter binding of the substrate, the the rate of reaction: (A) ； lower, (B) P； lower, (C) S； higher, (D)； higher, (E) S； lower.

18. cAMP and cGMP are ____________________ with phosphate esterified as a cyclic ____________________ and are important as ____________________ of cellular metabolism. (A) nucleotides； phosphodiester； inhibitors, (B) nucleotides； phosphomonoesters, regulators, (C) nucleotides； phosphodiesters, regulators, (D) nucleosides； phosphomonoesters, stimulators, (E) all of the above.

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