题目内容

当放射性同位素14C、15N同时标记的天冬氨酸酸进入动物体内时，有部分化合物将存在标记原子。下列哪种化合物可能同时存在15N、14C

A. 尿素
B. 肾上腺素
C. AMP
D. UMP
E. 肌酸

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痛风症时，沉积于关节、肾等处的成分是

A. 肌酸
B. 尿酸
C. 尿素
D. 胆固醇
E. 黄嘌呤

下列嘌呤核苷酸从头合成的原料中，错误的是

A. 甘氨酸
B. 天冬氨酸
C. 谷氨酸
D. C02
E. 一碳单位

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