知到答案生物化学（英文版）智慧树答案_2022年

吉林医药学院

第一章

At the isoelectric point, the net charge of the protein molecule is 0.
答案:对
All the proteins have quaternary structure.
答案:错
The principle of salt precipitation, precipitation of proteins is ( )
To neutralize the charge and destroy the hydration shell
Denature proteins
Lowering the dielectric constant of the protein solution
Adjust the isoelectric point of the protein solution
答案:To neutralize the charge and destroy the hydration shell
The main chemical bond that maintains the alpha-helical structure of the protein is( )
Hydrogen bonding between side chains
Salt key
Hydrogen bonding between peptide bond atoms
peptide bond
答案:peptide bond
The advanced structure of the protein depends on ( )
Peptide bonds in protein peptide chains
Peptide units in protein peptide chains
Hydrogen bonds in protein peptide chains
Peptide bond plane in protein peptide chain
答案:Hydrogen bonds in protein peptide chains
The physical and chemical properties shared by proteins and amino acids are: ( )
Amphoteric Dissociation
Denatured properties
Colloidal properties
Precipitation properties
答案:Amphoteric Dissociation
The properties of denatured proteins are ( )
Solubility drops significantly
Solidification
precipitation
Easy to be hydrolyzed by protease
答案:Loss of biological activity;precipitation;Easy to be hydrolyzed by protease
Protein denaturation is because ( )
The hydration membrane is destroyed and the charge is neutralized
Peptide bond cleavage
Subunit depolymerization
Disulfide bond cleavage
答案:Hydrogen bond is destroyed;The hydration membrane is destroyed and the charge is neutralized;Disulfide bond cleavage
Primary structure of protein ( )
It does not include disulfide bond
Is the basis of spatial structure
refers to amino acid sequence
α-helix and β-sheet are the major conformations of it
答案:It mainly depends on peptide bond to maintain stability;It does not include disulfide bond;α-helix and β-sheet are the major conformations of it
Which of the following are acid amino acids? ( )
Lysine
Alanine
Aspartate
Glutamate
答案:Lysine;Alanine