肽链合成的终止阶段发生的反应有（）。
A. 释放因子(RF)进入A位
B. 肽链水解释放
C. tRNA、mRNA、RF的脱落及核糖体大、小亚基的分离
D. 核糖体循环
E. 氨基酸活化
肽链合成后的加工主要的形式有（）。
A. 肽链N-端的切除。
B. 个别氨基酸的化学修饰。
C. 肽段的切除。
D. 亚基聚合和辅基的连接。
E. 肽链的形成。
A producer is someone who is generally ______ the preparation of a film but doesn’t direct the actors.
A. take charge of
B. be responsible for
C. in defiance of
D. in charge of
He could create ______ that have meaning ______ the time and places of his plays.
A. character; beyond
B. characters; beyond
C. characteristic; on
D. persons; in
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