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【单选题】
清代撰写的( )(1799),则是世界上第一部有关设计师的传记。A.
《历代名画记》
B.
《中国机器学家考》
C.
《畴人传》
D.
《》
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举一反三
【单选题】Which one of the following is not safety precaution?
A.
The safety cap.
B.
B Safety shoes
C.
C The jacket
D.
D Working clothes
【单选题】Which one of the following is true of both eukaryotic and prokaryotic gene expression and would therefore not be an effective target for drug development?
A.
After transcription, a 3 ′ -poly(A) tail and a 5 ′ -cap are added to mRN
B.
Translation of mRNA can begin before transcription is complete.
C.
mRNA is synthesized in the 3 ′ -to-5 ′ direction.
D.
RNA polymerase binds at a promoter region upstream of the gene.
E.
Mature mRNA is always precisely collinear to the gene from which it was transcribed.
【单选题】NASA is releasing several images taken by the Hubble Space Telescope, which is the closest yet look at the red planet. Altogether there are four images, which show the entire planet. Each view shows t...
A.
Vague.
B.
Clear.
C.
Cannot be seen.
D.
Barely visible.
【简答题】软件测试与调试的主要区别是什么?
【单选题】Which one of the following statements about catabolite-regulated operons is false?
A.
cAMP receptor protein (CRP) and catabolite activator protein (CAP) are different names for the same protein.
B.
when glucose is present in the cell cAMP levels fall.
C.
CRP binds to cAMP and as a result activates transcription.
D.
CRP binds to DNA in the absence of cAMP.
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