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Theρfactor possesses both ATPase and helicase activity.()

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When transcription is terminated in prokaryotes,σfactor can recognize the termination signal.()

Which of the following descriptions about transcription termination in prokaryotic cell is correct:()

A. occurs randomly
B. depends on theρfactor of the holoenzyme of RNA polymerase
C. If the transcription terminator sequence contains palindromic sequence, ρfactor is not necessary for the termination.
D. It can effectively terminate the transcription process if the end of the gene is rich of A-T.

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Which of the following is the necessary and sufficient condition(充要条件) of the effective initiation of bacterial transcription:()

A. Helicase
B. Primase
C. The holoenzyme of RNA polymerase
D. The core enzyme of RNA polymerase
E. RNA polymeraseⅡ

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The signal of transcription termination prokaryotic cell is:()

A. Termination codon
B. Terminator
C. The end of DNA chain
D. The inactivation of RNA polymerase

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