试题与答案

典型苯丙酮尿症的发病机理是A.酪氨酸羟化酶受抑制 B.苯丙氨酸-4-羟化酶缺陷 C.

题型:单项选择题

题目:

典型苯丙酮尿症的发病机理是

A.酪氨酸羟化酶受抑制

B.苯丙氨酸-4-羟化酶缺陷

C.四氢生物喋呤生成不足

D.脑内5-羟色胺不足

E.二氢生物喋呤还原酶先天缺陷

答案:

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参考答案:A解析:社区的构成要素有:地域、人口、文化制度和生产方式、地缘感。

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