A．酶与底物共价结合的活性位点；B．酶与底物非共价结合的活性位点；C．对于一个与蛋白质以共价形式相作用的小分子……

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( )。

单项选择题The hormone glucagons(胰高血糖素) stimulates the breakdown of stored glycogen in liver and muscle cells by the following enzymes. Which is the first enzyme that must be activated ( )