题目内容

比较并指出细菌与真核生物mRNA翻译机理的异同。

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单链DNA结合蛋白与DNA结合使其解链。 ( )

A. 对
B. 错

DNA双螺旋稳定因素有、及__。

阻遏蛋白是能与操纵基因结合从而阻碍转录的蛋白质。 ( )

A. 对
B. 错

I __________ come yesterday but I had an important meeting to attend．

A. had to
B. must have
C. ought
D. was to have