5. Once acetylcholine binds to its receptor in the postsynaptic membrane, the membrane first becomes to open _______ channel, resulting in a depolarization. Then, followed by an outward flow of ______ , resulting in a hyperpolarization. (A) (B) K⁺ , Cl⁻ (C) (D) Na⁺ , K⁺ (E) Na⁺

4. Which of the following statements is not true? (1) The lipids of archaeal membranes do not contain a carboxylic acid ester, but instead have an ether link to the glycerol. (2) A suspension of triacylglycerols and glycerophospholipids is most likely to form a liposome. (3) A bacterium such as E. coli is shifted from a warmer growth temperature to a cooler growth temperature, it compensates by adding more unsaturated fatty acids into its membranes. (4) Human B blood type is determined by the expression of α-1,3-N-galactosylaminyltransferase. (5) Phosphatidylserine is exclusively in the inner leaflet of the plasma membrane of the human erythrocyte membrane and is wildly used in apoptosis detection. (A) 1 and 3, (B) 2 and 4, (C) 3 and 5, (D) only 4, (E) only 5.

5. Once acetylcholine binds to its receptor in the postsynaptic membrane, the membrane first becomes to open _ channel, resulting in a depolarization. Then, followed by an outward flow of , resulting in a hyperpolarization.
(A)
(B) K⁺ , Cl⁻
(C)
(D) Na⁺ , K⁺
(E) Na⁺

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