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【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.
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举一反三
【单选题】GBZ/T159中，“标准采样体积”是指在哪个大气压下的采样体积：（）
A.
101.3Pa
B.
101.3kPa
C.
100.3Pa
D.
113kPa
E.
103kPa
【单选题】在职业卫生空气监测中，空气采样体积要换算成标准状况下的体积，“标准状况”是指（）。
A.
气温20℃，大气压103.1kPa
B.
气温10℃，大气压110.3kPa
C.
气温10℃，大气压101.3kPa
D.
气温0℃，大气压101.3kPa
E.
气温0℃，大气压103.1kPa