2024智慧树网课答案 生物化学（英文版） 最新完整智慧树知到满分章节测试答案

第一章 单元测试

1、 问题:

At the isoelectric point, the net charge of the protein molecule is 0.

选项：
A:对
B:错
答案: 【
对
】

2、 问题:

All the proteins have quaternary structure.

选项：
A:对
B:错
答案: 【
错
】

3、 问题:

The principle of salt precipitation, precipitation of proteins is (  )

选项：
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、 问题:

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

选项：
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、 问题:

The advanced structure of the protein depends on (  )

选项：
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、 问题:

The physical and chemical properties shared by proteins and amino acids are: (  )

选项：
A:Polymer properties
B:Colloidal properties
C:Amphoteric Dissociation
D:Precipitation properties
E:Denatured properties
答案: 【
Amphoteric Dissociation
】

7、 问题:

The properties of denatured proteins are (  )

选项：
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、 问题:

Protein denaturation is because (  )

选项：
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、 问题:

Primary structure of protein (  )

选项：
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、 问题:

Which of the following are acid amino acids? (  )

选项：
A:Glutamate
B:Lysine
C:Arginine
D:Aspartate
E:Alanine
答案: 【
Glutamate
Aspartate
】

第二章 单元测试

1、 问题:

T_m is directly related to the GC content of DNA and ionic strength.

选项：
A:对
B:错
答案: 【
对
】

2、 问题:

rRNA is the site for protein biosynthesis.

选项：
A:对
B:错
答案: 【
错
】

3、 问题:

In a DNA molecule, if the molar ratio of A is 17.2%, the molar ratio of C should be (  )

选项：
A:67.2％
B:32.8％
C:65.6％
D:17.2％
E:50.3%
答案: 【
32.8％
】

4、 问题:

The key part of DNA molecule to store and transmit genetic information is (  )

选项：
A:Pentose conformation
B:base rotation angle
C:base sequence
D:pentose phosphate skeleton
E:phosphate diester bond
答案: 【
base sequence
】

5、 问题:

The force to maintain the lateral stability of DNA double helix is (  )

选项：
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、 问题:

What's wrong with nucleic acid hybridization (  )

选项：
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、 问题:

The changes in DNA denaturation are: (  )

选项：
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、 问题:

The histones that make up the core particle of nucleosome are (  )

选项：
A:H₁
B:H₂A
C:H₂B
D:H₃
E:H₄
答案: 【
H₂A
H₂B
H₃
H₄
】

9、 问题:

As for the description of rRNA, it is correct to (  )

选项：
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、 问题:

The biological functions of nucleotides in vivo include (  )

选项：
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
】

第三章 单元测试

1、 问题:

Vitamins are a class of high molecular organic compounds 

选项：
A:对
B:错
答案: 【
错
】