题目内容

In the process of DNA replication, lagging strand is synthesized in the opposite direction of fork movement and discontinuously.We call it()

A. replication fork
B. Okazaki fragment
C. leading strand
D. lagging strand
E. all the above

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In prokaryotes, many enzymes are involved in DNA replication, including ①DNA-pol Ⅲ ②helicase ③DNA-polⅠ④ primase ⑤DNA ligase ⑥topoisomerase.These enzymes do their function in a special sequence, this sequence should be ( )

A. ⑥→②→③→①→④→⑤
B. ⑥→②→④→①→③→⑤
C. ④→①→④→⑤→②→⑥
D. ③→④→⑤→②→①→⑥
E. ④→⑥→①→③→②→⑤

which enzyme is used to convert RNA into DNA ( )

A. DNA-pol
B. helicase
C. RNA-pol
D. primase
E. reverse transcriptase

The factor which can recognize the terminator of RNA transcription is ()

A. α factor
B. β factor
C. σ factor
D. ρ factor
E. γ factor

DNA-dependent RNA polymerase is composed of many subunits, the component of core enzyme is ()

A. ααββ'
B. ααββ'σ
C. ααβ'
D. ααβ
E. αββ'