肽链合成过程中每活化一个氨基酸消耗ATP分子中高能键的数目是()。
A.2个
B.3个
C.4个
D.6个
E.8个
参考答案:A
—I am __________ endless examinations.
—Cheer up, David. Keep on until the college entrance examination ends. [ ]
A. caught up with
B. come up with
C. fed up with
D. put up with
下列不属于雏鸡必需氨基酸的是()。
A、苏氨酸
B、缬氨酸
C、甘氨酸
D、丙氨酸