A．胆固醇可防止膜磷脂氧化； B．正常细胞恶变过程中，胆固醇 磷脂增加；C．胆固醇 磷脂下降，细胞电泳迁移率减……

单项选择题配体(ligand)是（ ）。

单项选择题肌动蛋白纤维对于黏着斑就像( )对于半桥粒。

单项选择题Developing frog embryos treated with anti-fibronectin antibodies

单项选择题All of the following are true about antisense RNA except ( )

单项选择题The 5S rRNA differs from the other cellular rRNAs in which of the following ways ( )

单项选择题A eukaryotic cell has( )

单项选择题Which one of the following was used to determine the structure of the DNA molecule ( )

单项选择题Plant guard cells(保卫细胞) have a higher [C1-] than the outside environment. The most likely explanation for this is( ).

单项选择题在下列组织中, 紧密连接特别重要的有( )

单项选择题钙泵的作用主要是( )。