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【单选题】
HGPRT（次黄嘌呤-鸟嘌磷酸核糖转移酶）参与下列哪种反应A.
嘌呤核苷酸从头合成
B.
嘧啶核苷酸从头合成
C.
嘌呤核苷酸补救合成
D.
嘧啶核苷酸补救合成
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反馈参考答案：
举一反三
【简答题】完形填空。 Believe it or not, there are good reasons for 1 a school uniform. It makes you feel 2 of your school. It builds a common spirit of unity (团结精神) among students and reminds (提醒) them of the values...
【单选题】The deadweight loss from monopoly arises because
A.
The monopoly firm makes higher profits than a competitive firm would.
B.
Some potential consumers who forgo buying the good value it more than its marginal cost.
C.
Consumers who buy the good have to pay more than marginal cost, reducing their consumer surplus.
D.
The monopoly firm chooses a quantity that fails to equate price and average revenue.
【简答题】用词组的适当形式填空。 Believe it or not be based on/ upon such as play a special role in because of in some ways be different from make good use of at present come up 1. B...
【多选题】下列哪一叙述符合化学渗透假说的观点？
A.
电子传递链中的递氢和递电子体是交替排列的
B.
H+不能自由通过线粒体内膜
C.
线粒体内膜外侧的H+比内膜内侧低
D.
线粒体膜两侧的电位差是合成ATP的能量基础
E.
递氢体具有氢泵作用
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