题目内容

The main chemical bond that maintains the alpha-helical structure of the protein is

A. peptide bond
B. Hydrogen bonding between peptide bond atoms
C. Hydrogen bonding between side chains
D. Salt key
E. Disulfide bond

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The principle of salt precipitation, precipitation of proteins is

A. Binding of proteins to form insoluble protein salt
B. To neutralize the charge and destroy the hydration shell
C. Lowering the dielectric constant of the protein solution
D. Adjust the isoelectric point of the protein solution
E. Denature proteins

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