题目内容

胆固醇是转化合成睾酮、孕酮和雌二醇等性激素的前体物质。 ()

A. 正确
B. 错误

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【B5】

A. on
B. in
C. for

听力原文:M: Do I look nice in this blue shirt, dear?
W: Don't you think you're too big for it?
Q: What does the woman think of the man's shirt?
(23)

A. It's very nice.
B. Its color is good.
C. It doesn't fit him.

尿素的合成主要在肝脏的线粒体和胞液中进行,合成一分子尿素需消耗四分子ATP,而精氨酸代琥珀酸合成酶是尿素合成的关键酶。 ()

A. 正确
B. 错误

磷酸戊糖途径是生物体内生成5-磷酸核糖的唯一代谢途径。 ()

A. 正确
B. 错误

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