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【简答题】
噬菌体中DNA分子具有短的互补的单链末端，当它感染细菌时该分子环化。图16-3-7的A和B分别显示用Bam限制酶处理游离的DNA分子后得到的限制酶图谱和凝胶电泳条带。从受感染的细胞中分离出DNA进行特性研究。在某些条件下酶解后的片段经电泳后结果如图16-3-7C所示。试问在这些条件下DNA呈怎样的结构?
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【单选题】?Read the newspaper article below about the creation of new jobs. ?Choose the correct word to fill each gap, from A, B or C on the opposite page. ?For each question 29-40, mark one letter (A, B or C) ...
A.
much
B.
many
C.
lot
【单选题】?Read the minutes below from a Health and Safety committee meeting. ?Choose the correct word to fill each gap from A, B or C on the opposite page. ?For each question (29-40), mark one letter (A, B or ...
A.
from
B.
for
C.
of
【单选题】Questions 29-40 •Read the article below about time management. •Choose the correct word to fill each gap from A, B or C on the opposite page. •For each question (29-40), mark one letter (A, B or C) on...
A.
but
B.
or
C.
even
【简答题】喷射性呕吐伴头痛、颈强直常见于
【判断题】Read the passages on Page 29 and 30, and then decide “ true or false ” . (读29到30页文章,判断下列5题正误。) 1. Jack usually gets up early in the morning.
A.
正确
B.
错误
【单选题】? Read the article below about McDonald's hamburger and Australian economy. ? Choose the correct word to fill each gap, from A, B, or C on the opposite page. ? For each question 29-40, mark one letter...
A.
these
B.
which
C.
that
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