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19. What should people do in listening to each conversation?Try to notice the.

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20. How can people start watching their first video?All they need to do is to click on the link of.

嘌呤碱在体内分解代谢的特征性产物是

A. 肌酸
B. 肌酐
C. 尿酸
D. 尿素
E. 乳酸

尿酸在体内堆积可引起

A. 痛风症
B. 风湿病
C. 坏血病
D. 尿黑酸症
E. 分子病

嘌呤核甘酸从头合成时首先生成的是

A. GMP
B. AMP
C. IMP
D. GDP
E. ADP