【单选题】【消耗次数：1】
胆固醇生物合成的限速酶是（）
①
HMGCoA合成酶
②
羟基戊酸激酶
③
HMGCoA还原酶
④
鲨烯环氧酶
⑤
HMGCoA裂解酶
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有关氨基酰-tRNA合成酶的说明，其中正确的是().
①
A.每种氨基酸至少有一种相应的合成酶
②
B.反应过程中由ATP提供两个高能键
③
C.该酶对氨基酸和tRNA一样具有绝对专一性
④
D.催化氨基酸的羧基与相应的tRNA的3’-末端腺苷酸3’-OH之间形成酯键
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to be paid
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get paid
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that I receive pay
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strong
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heavier
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as lucky as
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get for
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objected having
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objected to have
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objected to having
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long
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credit
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attention
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focus
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often
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always
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routine
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infectious
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