题目内容

He ____ at the meeting, but his heart attack prevented him.

A. will speak
B. is going to speak
C. had to speak
D. was going to speak

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I ____ ping-pong quite well, but I haven’t had time to play since the New Year.

A. will play
B. have played
C. played
D. play

翻译的产物是

A. 戊糖
B. 核酸
C. 蛋白质
D. 氨基酸

蛋白质生物合成中，多肽链上氨基酸的排列顺序取决于

A. 相应tRNA的专一性
B. 相应氨酰-tRNA合成酶的专一性
C. 相应tRNA上反密码子排列顺序
D. 相应mRNA上密码子排列顺序

下列有关终止密码叙述正确的是

A. 决定蛋氨酸的密码
B. 参与肽链的延长
C. 终止密码有三个：UAA、UAG、UGA
D. AUG也是终止密码