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【判断题】
一个逻辑变量有 0 和 1 两种可能的取值,因此,一个 n 变量的逻辑函数有 2^n 个最小项。A.
正确
B.
错误
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【单选题】下列关于嘌呤核苷酸从头合成的叙述，正确的是( )
A.
嘌呤环的氮原子均来自氨基酸的α-氨基
B.
合成过程中不会产生自由嘌呤碱
C.
氨基甲酰磷酸为嘌呤环提供氨甲酰基
D.
由IMP合成AMP和GMP均由ATP供能
E.
次黄嘌呤鸟嘌呤磷酸核糖转移酶催化IMP转变成GMP
【单选题】There are certain ________ when you must interrupt people who are in the middle of doing something. [ ]
A.
conditions
B.
situations
C.
occasions
D.
environment
【单选题】下列关于嘌呤核苷酸从头合成的叙述哪项是正确的?()
A.
由IMP合成AMP和GMP均由ATP供能
B.
嘌呤环的氮原子均来自氨基酸的α氨基
C.
合成过程中不会产生自由嘌呤碱
D.
氨基甲酰磷酸为嘌呤环提供氨甲酰基
【简答题】嘌呤环从头合成过程中( )提供核苷酸的磷酸核糖部分,在其上再完成嘌呤环的装配
【单选题】There are certain ______ when you have to interrupt people who are in the middle of doing something.
A.
chances
B.
situations
C.
occasions
D.
opportunities
【简答题】Questions 1 to 5 are based on the following passage. Nobody really knows how big Lagos is. What's indisputable is that it's growing very quickly. Between now and 2050, the population of Africa c...
【简答题】Nobody really knows how big Lagos is. What's indisputable is that it's growing very quickly. Between now and 2050, the population of Africa could triple. Yet cities in sub-Saharan Africa are not...
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