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【单选题】
如果遗传密码是四联体密码而不是三联体,而且tRNA反密码子前两个核苷酸处于摆动的位置,那么蛋白质正常合成大概需要多少种tRNA?A.
约256种不同的tRNA
B.
150～250种不同的tRNA
C.
小于20种
D.
与三联体密码差不多的数目
E.
取决于氨酰-tRNA合成酶的种类
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