题目内容

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

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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

The basic unit of composing nucleic acid is ( )

A. ribose and deoxyribose
B. phosphate and ribose
C. base
D. mononucleotide
E. Polynucleotide

in certain DNA molecule, the content of adenine is 30%,then, the content of guanine is ( )

A. 15%
B. 20%
C. 30%
D. 60%
E. 80%