2021 Structural Biochemistry（结构生物化学）(南京大学) 最新满分章节测试答案

文章目录[隐藏]

Chapter 4 Structure and Function of Enzymes Quiz4
Chapter 1 Structure and Function of Proteins Quiz 1
Chapter 2 Structure and Function of Nucleic Acids Quiz 2
Chapter 3 Properties of Proteins and Nucleic Acids Quiz 3
Chapter 5 Structure and Function of Carbohydrates and Lipids Quiz5
Chapter 6 Structure and Function of Hormones Quiz6

本答案对应课程为:点我自动跳转查看
本课程起止时间为:2021-11-14到2021-11-14
本篇答案更新状态:已完结

Chapter 4 Structure and Function of Enzymes Quiz4

1、问题:The main reasons why DNA cannot be used as an enzyme are:
选项：
A:Cannot form a single stranded structure
B:Contains T
C:Contains no U
D:Lack 2′-OH
E:Cannot bind metal ions
答案: 【Lack 2′-OH】

2、问题:The virus that belongs to ribozymes is:
选项：
A:HAV
B:HBV
C:HCV
D:HDV
E:HIV
答案: 【HDV】

3、问题:The following amino acid residues that are most unlikely to participate in the catalytic reaction at the enzyme active center are:
选项：
A:Ala
B:Ser
C:Cys
D:Tyr
E:Lys
答案: 【Ala】

4、问题:The aldolase involved in glycolysis belongs to:
选项：
A:EC1
B:EC2
C:EC3
D:EC4
E:EC5
F:EC6
答案: 【EC4】

5、问题:If an enzyme uses kinetics as a means of regulation, then the enzyme substrate concentration is usually found to be:
选项：
A:close to Km
B:Far below the Km
C:Far above the Km
D:close to kcat/Km
E:[E]
答案: 【close to Km】

6、问题:Do you think the common properties of alcohol dehydrogenase in mice and humans must be:
选项：
A:optimal pH
B:optimal temperature
C:kcat
D:Km
E:the equilibirum constant
答案: 【the equilibirum constant】

7、问题:After a typical Michaelis enzyme doubles its concentration, the Km value will:
选项：
A:increase by two times
B:double
C:decrease by two times
D:halve
E:stay the same
答案: 【stay the same】

8、问题:The double reciprocal plot of an enzyme shows a slope of 5×10-4min/L and a longitudinal intercept of 0.1min/mol. From which you can conclude that:
选项：
A:Km/Vmax is 200
B:The turnover number of the enzyme is 100min-1
C:The equilibrium constan of which the enzyme substrate complex dissociates into tenzyme and product is 0.005mol/L
D:When the substrate concentration is 0.005mol/L, the reaction rate is 5mol/min
E:The reaction rate increases linearly with increasing substrate concentration
答案: 【When the substrate concentration is 0.005mol/L, the reaction rate is 5mol/min】

9、问题:Which inhibition can be reduced by increasing the [S] is:
选项：
A:competitive inhibition
B:non-competitive inhibition
C:uncompetitive inhibition
D:irreversible inhibition
E:unpredictable
答案: 【competitive inhibition】

10、问题:When the degree of inhibition is 50%, [I]=Ki. The inhibitor belongs to:
选项：
A:competitive inhibition
B:non-competitive inhibition
C:uncompetitive inhibition
D:irreversible inhibition
E:unpredictable
答案: 【non-competitive inhibition】

11、问题:Uncompetitive inhibitors of enzymes can:
选项：
A:decrease both Vmax and Km
B:increase both Vmax and Km
C:don’t change Vmax, but increase Km
D:don’t change Vmax, but decrease Km
E:decrease Vmax and increase Km
答案: 【decrease both Vmax and Km】

12、问题:Diisopropylfluorophosphoric acid and iodoacetic acid are enzyme group-specific inhibitors and are specific for two amino acid residues, these two amino acid residues are respectively:
选项：
A:Thr and Ser
B:Thr and Cys
C:Ser and His
D:Ser and Cys
E:Cys and Ser
答案: 【Ser and Cys】

13、问题:Assuming that a mutation causes the structure of the active center of an enzyme to be more complementary to the substrate than to the transition state, the effect of this mutation on the enzymatic reaction is:
选项：
A:Increasing the reaction rate
B:decreasing the reaction rate
C:unchanging the reaction rate
D:changing the equilibrium constant
E:being unpredictable
答案: 【decreasing the reaction rate】

14、问题:Among the various regulatory mechanisms of enzyme activity, the slowest one is:
选项：
A:enzyme synthesis
B:enzyme degradtion
C:allosteric control
D:proteolytic activation
E:covalent modification
答案: 【enzyme synthesis】

15、问题:The following defects that have the most serious impact on protein digestion come from:
选项：
A:chymotrypsin
B:trypsin
C:pepsin
D:elastase
E:carboxylpeptidase
答案: 【trypsin】

16、问题:The vitamin that the gastrectomy patients and vegans are prone to lack is:
选项：
A:B1
B:B2
C:B3
D:B6
E:B12
答案: 【B12】

17、问题:Vitamin that are easily deficient in blocked biliary tract is
选项：
A:A
B:C
C:B1
D:B2
E:B3
答案: 【A】

18、问题:The vitamin whose deficiency can cause beriberi is
选项：
A:B1
B:B2
C:B3
D:B5
E:B6
答案: 【B1】

19、问题:The vitamin associated with coenzyme I is
选项：
A:B1
B:B2
C:B3
D:B6
E:B12
答案: 【B3】

20、问题:The model used to explain the stereospecificity of enzyme action is
选项：
A:lock and key
B:induced fit
C:three-point attachment
D:the concerted change
E:the sequential change
答案: 【three-point attachment】

21、问题:The following statements about enzymes are correct: