题目内容

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

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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'

The initiation codon is ()

A. UGA
B. UAA
C. UAG
D. AUG
E. all of above

how many stop codon are there()

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

Each ribosomal cycle includes three steps: positioning、transpeptidation and ()

A. initiation
B. elongation
C. termination
D. translocation
E. all of above