91.關於通過細胞膜的促進性擴散作用（facilitated diffusion），下列敘述何者正確？
(A)經由專一性膜蛋白質的作用，降低溶質通過細胞膜的活化能
(B)經由專一性膜蛋白質的作用，增加擴散性溶質之穿膜濃度梯度的大小
(C)被運載溶質的極性會影響脂雙層之特性
(D)細胞利用此機轉運輸氧氣、氮氣或甲烷等氣體通過細胞膜

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統計： A(408), B(148), C(48), D(32), E(0) #1844867

詳解 (共 4 筆)

#4909101
促進擴散：本來無法通過的物質，藉由特殊轉...
(共 99 字，隱藏中）
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#4994207
A：促進性擴散B：主動運輸D：簡單擴散
(共 21 字，隱藏中）
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#5542692
B、如果改變擴散性溶質穿膜濃度梯度大小的...
(共 49 字，隱藏中）
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#5681995

ch11-21. Which statement about facilitated diffusion across
a membrane is TRUE?
A) A specific membrane protein lowers the activation energy for movement of the solute through the membrane.
B) It can increase the size of a transmembrane con-
centration gradient of the diffusing solute.
C) It is impeded by the solubility of the transported solute in the nonpolar interior of the lipid bilayer.
D) It is responsible for the transport of gases such as O2, N2, and CH4 across biological membranes.
E) The rate is not saturable by the transported substrate.
Ans:A) A specific membrane protein lowers the activation energy for movement of the solute through the membrane.

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