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 r8 3lbi2**tau+ ,jdhrafvcj.a ow in the table reg hjdd;khxe/n .2des uzx -9*+xarding 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 phospholiabqvjha : 1b*4pid bilayer. This phospholipid bilayer forms 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 (Choices 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 phah41b: qv jba*ospholipids means that the vesicles form through self-assembly.
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