本题目来源于试卷: Unity and Diversity A.3 Origin of Cells，类别为 IB生物学
[单选题]
Identify the correct row in the zce4f9 my3wazjg e- 3)s,j6pjtable rk ( .hlocsj o6q3gay9)dgjs:oby7+e 1egarding the formation of vesicles.
A. Structure of vesicle is monolayer;Feature of fatty acid tail is hydrophilic;Formation is spontaneous
B. Structure of vesicle is bilayer;Feature of fatty acid tail is hydrophobic;Formation is spontaneous
C. Structure of vesicle is monolayer;Feature of fatty acid tail is hydrophilic;Formation is induced
D. Structure of vesicle is bilayer;Feature of fatty acid tail is hydrophobic;Formation is induced
参考答案: B
本题详细解析:
Vesicles are formed from a phospholipid bilayer. This phospholipid bilayer form( eaaxwlha1b9 wi+(z)lq mk)7s spontaneously because the phosphate heads are hydrophilic (‘water loving’), and the fatty acid tails are hydrophobic (‘water hating’). Therefore Choice B is correct.The membrane around the vesicle is not a single layer (+k awl)(ebxm17zqh)ai9 l(w aChoices A and C) of phospholipids due to the hydrophilic phosphate heads naturally pointing outwards and inwards into the aqueous environments, and the hydrophobic fatty acid tails aligning in the centre to minimise their exposure to water. Vesicles are not induced to form in cells (Choices C and D) as the amphipathic nature of the phospholipids means that the vesicles form through self-assembly.
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