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【单选题】
磷酯分子在细胞膜中的排列规律是______。
A.
极性头朝向膜的内、外两侧，疏水尾朝向膜的中央
B.
极性头朝向细胞的外侧，疏水尾朝向细胞的内侧
C.
极性头都朝向细胞的内侧，疏水尾朝向细胞的外侧
D.
以上都不对
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