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
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
Which of the following factor is related to transcription termination in prokaryotic cell:()
A. σ
B. α
C. β
D. ρ
E. γ
The ternary complex in the elongation step of transcription consists of:()
A. Complex ofσfactor, core enzyme and DNA strand which are formed in the promoter region.
B. Complex of core enzyme, DNA strand and nascent RNA chain
Complex of three holoenzymes formed in transcription start site
D. Complex ofσfactor, core enzyme and helicase
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