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生物化学（英文版） 2024智慧树满分答案
第一章 单元测试
1、判断题：
At the isoelectric point, the net charge of the protein molecule is 0.
A:对
B:错
答案: 对
2、判断题：
All the proteins have quaternary structure.
A:对
B:错
答案: 错
3、单选题：
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
答案: To neutralize the charge and destroy the hydration shell
4、单选题：
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
答案: Hydrogen bonding between peptide bond atoms
5、单选题：
The advanced structure of the protein depends on ( )
A:Hydrogen bonds in protein peptide chains
B:Peptide bonds in protein peptide chains
C:Amino acid composition and sequence in protein peptide chains
D:Peptide bond plane in protein peptide chain
E:Peptide units in protein peptide chains
答案: Amino acid composition and sequence in protein peptide chains
6、单选题：
The physical and chemical properties shared by proteins and amino acids are: ( )
A:Polymer properties
B:Colloidal properties
C:Amphoteric Dissociation
D:Precipitation properties
E:Denatured properties
答案: Amphoteric Dissociation
7、多选题：
The properties of denatured proteins are ( )
A:Solubility drops significantly
B:Loss of biological activity
C:Easy to be hydrolyzed by protease
D:Solidification
E:precipitation
答案: Solubility drops significantly;Loss of biological activity;Easy to be hydrolyzed by protease
8、多选题：
Protein denaturation is because ( )
A:Hydrogen bond is destroyed
B:Peptide bond cleavage
C:Subunit depolymerization
D:The hydration membrane is destroyed and the charge is neutralized
E:Disulfide bond cleavage
答案: Hydrogen bond is destroyed;Subunit depolymerization;Disulfide bond cleavage
9、多选题：
Primary structure of protein ( )
A:Is the basis of spatial structure
B:refers to amino acid sequence
C:It does not include disulfide bond
D:It mainly depends on peptide bond to maintain stability
E:α-helix and β-sheet are the major conformations of it
答案: Is the basis of spatial structure;refers to amino acid sequence;It mainly depends on peptide bond to maintain stability
10、多选题：
Which of the following are acid amino acids? ( )
A:Glutamate
B:Lysine
C:Arginine
D:Aspartate
E:Alanine
答案: Glutamate;Aspartate
第二章 单元测试
1、判断题：
Tm is directly related to the GC content of DNA and ionic strength.
A:对
B:错
答案: 对
2、判断题：
rRNA is the site for protein biosynthesis.
A:对
B:错
答案: 错
3、单选题：
In a DNA molecule, if the molar ratio of A is 17.2%, the molar ratio of C should be ( )
A:67.2％
B:32.8％
C:65.6％
D:17.2％
E:50.3%
答案: 32.8％
4、单选题：
The key part of DNA molecule to store and transmit genetic information is ( )
A:Pentose conformation
B:base rotation angle
C:base sequence
D:pentose phosphate skeleton
E:phosphate diester bond
答案: base sequence
5、单选题：
The force to maintain the lateral stability of DNA double helix is ( )
A:Base packing force
B:hydrogen bond between base pairs
C:Internal screw drainage
D:disulfide bond
E:phosphodiester bond
答案: hydrogen bond between base pairs
6、单选题：
What’s wrong with nucleic acid hybridization ( )
A:Two single stranded DNA from different sources can be hybridized as long as some bases are complementary
B:DNA single strand can hybridize with RNA strand with almost the same complementary base
C:RNA DNA hybrid chain can be synthesized by reverse transcription using mRNA as template
D:mRNA can be hybridized with the encoded polypeptide chain
E:Using molecular hybridization, the target gene can be fished from gene library
答案: mRNA can be hybridized with the encoded polypeptide chain
7、多选题：
The changes in DNA denaturation are: ( )
A:Hydrogen chain breaking and double helix structure breaking between chains
B:hyperchromic effect
C:Viscosity increase
D:covalent bond fracture
答案: Hydrogen chain breaking and double helix structure breaking between chains;hyperchromic effect
8、多选题：
The histones that make up the core particle of nucleosome are ( )
A:H1
B:H2A
C:H2B
D:H3
E:H4
答案: H2A;H2B;H3;H4
9、多选题：
As for the description of rRNA, it is correct to ( )
A:Large and small subunits that can combine with proteins to form ribosomes
B:It’s the most abundant RNA in the cell
C:Containing more rare bases
D:No secondary structure
E:Shortest half-life
答案: Large and small subunits that can combine with proteins to form ribosomes;It’s the most abundant RNA in the cell
10、多选题：
The biological functions of nucleotides in vivo include ( )
A:As cytoskeleton
B:Raw materials for nucleic acid synthesis in vivo
C:Some nucleotides can be used as second messengers of hormones
D:Some nucleotides are allosteric effectors of allosteric enzymes
E:Some nucleotides are the direct energy suppliers in the organism
答案: Raw materials for nucleic acid synthesis in vivo;Some nucleotides can be used as second messengers of hormones;Some nucleotides are allosteric effectors of allosteric enzymes;Some nucleotides are the direct energy suppliers in the organism
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