题目内容

质粒与染色体DNA一样,失去质粒,细菌细胞就会死亡。

A. 对
B. 错

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在进行菌种保藏工作时,一般选用优良纯种的休眠体,为其提供一个营养充分利于生长的环境条件。

A. 对
B. 错

质粒可以在细菌之间进行转移。

A. 对
B. 错

I PrepareDuring the battle againstnovel coronavirus, medical workers, scientists and volunteers are always on the frontlines. They are regarded as .

A. heroes
B. role models
C. heroes in harm’s way

I PreparePresident Xi Jinping used three words to describe the distinct characters of hero models: , persistence, and simplicity.

A. loyalty
B. integrity
C. honesty

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