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【单选题】
反应器是符合活塞流模型的一类理想反应器，活塞流模型的假定包括：A.
轴向的混合用费克定律描述
B.
径向流速分布均匀和 径向温度分布均匀
C.
径向压力分布均匀
D.
速度侧形与层流相同
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following statements on DNA replication is CORRECT ?
A.
DNA is synthesized by extending the 3′ end of the primer, because the 3′-OH acts as a nucleophile during catalysis
B.
DNA Pol use s four different active sites to recognize the four different dNTPs when it catalyzes DNA synthesis
C.
DNA Pol does not add rNTP to the 3′ end of the growing DNA strand because rNTP concentrations are too low in cells
D.
During DNA replication, the leading strand and lagging strand are synthesized toward opposite directions and cannot be coordinated
【单选题】DNA replication in eukaryotes:
A.
usually starts at the same place every time
B.
only involve 2 different DNA polymerases
C.
is faster than in bacteria l DNA replication
D.
all of the above are false
【单选题】The primers in DNA replication are
A.
DNA fragments synthesized with DNA as template
B.
DNA fragments synthesized with RNA as template
C.
RNA fragment synthesized with DNA as template
D.
RNA fragments synthesized with RNA as template
E.
Primers still exist in the DNA strand after replication
【简答题】中国FDM技术的开拓者是清华大学的[填空(1)] 。
【多选题】The fidelity of DNA replication is maintained by:
A.
(1) base selection by the polymerase
B.
(2) a 3′→5′ proofreading exonuclease activity that is part of most DNA polymerases
C.
(3) specific repair systems for mismatches left behind after replication
D.
all the above
【简答题】中国FDM技术的开拓者是清华大学的[ ]。A. 颜永年
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