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【单选题】
真核生物细胞内 存在着种类繁 多、长度为 21-23 个核苷酸的小分子 RNA (简称 miRNA ),它们能与相关基因转录出来的 mRNA 互补,形成局部双链。由此可以推断这些 miRNA 抑制基因表达的分子机制是A.
阻断 rRNA 装配成核糖体
B.
妨碍 DNA 分子的
C.
干扰 tRNA 识别密码子
D.
影响 RNA 分子的远距离转运
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A.
正确
B.
错误
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【单选题】What is the purpose of Parker's book?
A.
To find ways to establish virtual education system and to provide education for all.
B.
To examine the changes in university in the past and in the future.
C.
To promote the effort to solve problems of hunger, health through education.
D.
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【单选题】Which of the following is a purpose of communication?
A.
To establish and build goodwill
B.
To build self-esteem
C.
Both of the above describe a purpose of communication
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