用抗纤连蛋白的抗体注射胚体，发现在神经系统发育过程中神经嵴细胞的迁移受到抑制。这些实验说明：( )

单项选择题膜胆固醇的组成与质膜的性质、功能有着密切的关系,（ ）

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( )