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【单选题】
下列关于蛋白质生物合成的描述哪一项是错误的A.
氨基酸必需活化成活性氨基酸
B.
氨基酸的羧基端被活化
C.
体内所有的氨基酸都有相应密码子
D.
活化的氨基酸被搬运到核蛋白体上
E.
tRNA的反密码子与mRNA上的密码子按碱基配对原则结合
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【单选题】根据下列文章,请回答 36～40 题。Where Ha ve All the Frogs Gone? In the 1980s, scientists around the world began to notice something strange: Frogs were disappearing. More recent research has shown that many kinds ...
A.
knowledge about fatal human diseases.
B.
knowledge about air and water pollution.
C.
A chance to discover new medicines.
D.
an opportunity to detect poisonous gases.
【简答题】It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson. A．until B．after C．since D．when
【单选题】It is difficult for us to learn a lesson in life __________ we've actually had that lesson. [ ]
A.
when
B.
after
C.
since
D.
until
【单选题】It is difficult for us to learn a lesson in life ______ we’ve actually had that lesson.
A.
until
B.
after
C.
since
D.
when
【单选题】I’ve already told you that the fourth and last part of the article ______ the most difficult to understand.
A.
is
B.
was
C.
are
D.
were
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