题目内容

how many stop codon are there()

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

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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

In the following amino acid , which amino acid contain 2 COOH group ( )

A. serine
B. lysine
C. glutamate
D. alanine
E. tyrosine

which of the following method make protein precipitated keep biological activity( )

A. strong acid
B. salting-out
C. room temperature alcohol
D. alkaloid reagent
E. heavy metal ions