用丙酮从口腔上皮细胞中提取脂质,在空气—水界面上铺成单分子层

用丙酮从口腔上皮细胞中提取脂质,在空气—水界面上铺成单分子层,测得单分子层面积为S1,设细胞膜表面积为S2,则S1与S2关系最恰当的是(  )

A.S1=2S2  B.S1>2S2  C.S1<2S2  D.S2<S1<2S2

 

答案

B

 

磷脂双分子层构成生物膜的基本支架,因此细胞膜铺成单分子层后是表面积的2倍。口腔上皮细胞有具膜的细胞器,因此口腔上皮细胞生物膜铺成单分子层后大于细胞膜表面积S2的2倍。

 

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