Which of the following play an important role in maintaining the structure of antiparallel β-pleated sheet? ()
A. hydrogen bond between the amino acid side chain
B. electrostatic attraction
C. disulfide bond
D. peptide bond
E. Vander Waa1s
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Which of the following could keep the colloidal nature of protein? ()
A. the protein solution have more stronger consistency
B. electric charge surround the colloid
C. water membrane
D. the protein solution is true solution
E. electric charge surround the colloid and water membrane
The average nitrogen content of protein is: ()
A. 0.1
B. 0.12
C. 0.14
D. 0.16
E. 0.18
Which is the stucture of eukaryotic mRNA 3' end ? ()
A. poly A
B. poly U
C. poly T
D. poly C
E. poly G
Which one is correct about DNA denaturation? ()
A. hydrogen bond between the complementary base pair cleavage
B. the sequence of basic group is destroyed
C. DNA denaturation is irreversible
D. character of light absorption disappear
E. A260 is decreased
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