题目内容

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'

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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

The nitrogen content of a protein sample was 0.60g.How many grams of protein did the sample contain( )

A. 3.00g
B. 3.75g
C. 4.0g
D. 5.80g
E. 6.35g