题目

 In the Beijing Olympics, Phelps from the US is____person of wonder, ____person who swam into the Olympic history. A. the; the      B. the; a  C. a; the  D. a; a 答案：D已知某tRNA一端的三个碱基顺序是GAU，所转运的是亮氨酸，那么决定氨基酸的密码子是由下列哪个碱基序列转录而来的(　　)A. GAT B. GAUC. CUA D. CTA