绪论 单元测试

1、 问题:Biochemistry can be divided into three principal areas, that is：（ ）
选项：
A:the structural chemistry of the components of living matter and relationships of biological function to chemical structure
B:metabolism, the totality of chemical reactions that occur in living matter
C:genetic biochemistry, the chemistry of processes and substances that store and transmit biological information
D:study of structure of the Human Body
E:morphology change
答案: 【
the structural chemistry of the components of living matter and relationships of biological function to chemical structure
metabolism, the totality of chemical reactions that occur in living matter
genetic biochemistry, the chemistry of processes and substances that store and transmit biological information
】

第一章 单元测试

1、 问题:The nitrogen content of one protein sample is 0.5g，and then the protein content of it is ：（ ）
选项：
A:12.5g
B:6.25g
C:3.125g
D:1.565g
E:1.25g
答案: 【
3.125g
】

2、 问题:Which of the followings is basic AA? （ ）
选项：
A:Pro
B:Tyr
C:Met
D:Glu
E:Lys
答案: 【
Lys
】

3、 问题:Which of the following about α-helix is not correct：（ ）
选项：
A:the helix is right handed
B:3.6 residues per circle
C:the peptide bonds are the major bonds to stabilize the helix
D:the helix is clockwise
E:one pitch is 0.54nm
答案: 【
the peptide bonds are the major bonds to stabilize the helix
】

4、 问题:One AA( pI=5.6 ) will be negatively charged in a solution （ ）?
选项：
A:pH2.6
B:pH4.7
C:pH5.0
D:pH5.6
E:pH8.6
答案: 【
pH8.6
】

5、 问题:Which of the following about protein denaturaion is not correct?（ ）
选项：
A:The spatial structure of protein are destroied
B:the secondary bond of protein are broken
C:the physico-chemical property of protein changed
D:denatured protein must precipitate
E:precipitated protein not be sure to be denatured(C)
答案: 【
denatured protein must precipitate
】

6、 问题:All the common proein absorb light at a wavelength of UV close to （ ） nm?
选项：
A:200nm
B:260nm
C:280nm
D:300nm
E:340nm
答案: 【
280nm
】

7、 问题:The amino acid found as constituents of mammalian proteins are all ( ) except for glycine?（ ）
选项：
A:L-β-AA
B:D-β-AA
C:L-α-AA
D:D-α-AA
E:L，D-α-AA
答案: 【
L-α-AA
】

8、 问题:Which of the following about protein secondary structure is not correct? （ ）
选项：
A:it is local spatial structure of one certain part of peptide chain in protein
B:it is the relative spatial position of skeleton atom on protein main chain
C:amino acid sequence of protein
D:it did not involve in the conformation of side chain of amnio acid
E:it is hydrogen bond that maintain the stability of protein secondary structure
答案: 【
amino acid sequence of protein
】

9、 问题:Which of the following about quaternary structue is correct? （ ）
选项：
A:the stability of protein quaternary structure was maintained by disulfide bond
B:quaternary structure of protein would not sure to be destoried
C:the subunit were polymerized by noncovalent bond
D:quaternary structure was essential condition for maintaining the protein biological activity
E:all the protein have quaternary structure
答案: 【
the subunit were polymerized by noncovalent bond
】

10、 问题:α helix of protein structure belongs to（ ）
选项：
A:secondary structure
B:tertiary structure
C:quaternary structure
D:domain
E:motif
答案: 【
secondary structure
】

第二章 单元测试

1、 问题:5’-end of the majority of mRNA in eukaryotes has （ ）
选项：
A:poly (A) tail
B:cap sequence
C:stop codon
D:initiation codon
E:CCA-OH
答案: 【
cap sequence
】

2、 问题:Which statement is NOT true for tRNA? （ ）
选项：
A:tRNA is usually composed of 70-90 nucleotides.
B:tRNA contains rare bases.
C:The secondary structure of tRNA is cloverleaf structure.
D:Anticodon loop contains the anticodon that is composed of three bases CCA.
E:Various tRNA are present in the cell.
答案: 【
Anticodon loop contains the anticodon that is composed of three bases CCA.
】

3、 问题:Which statement is NOT true for RNA? （ ）
选项：
A:tRNA contains more rare bases than other RNAs.
B:It is usually single-stranded molecule.
C:mRNA contains the genetic codon.
D:rRNA is the place for protein synthesis.
E:RNA contains regional double-stranded structure.
答案: 【
rRNA is the place for protein synthesis.
】

4、 问题:Which statement is true for Tm? （ ）
选项：
A:Higher GC content，higher Tm.
B:Higher AT content, higher Tm
C:Higher purity of nucleic acid, larger range of Tm
D:Smaller nucleic acid, larger range of Tm.
E:The nucleic acid with higher
F:is usually RNA
答案: 【
Higher GC content，higher Tm.
】

5、 问题:The secondary structure of DNA is （ ）
选项：
A:double-stranded helix
B:regional double-stranded helix
C:supercoil
D:inverted L shape
E:polyA sequence
答案: 【
double-stranded helix
】

6、 问题:The tertiary structure of tRNA is （ ）
选项：
A:double-stranded helix
B:regional double-stranded helix
C:supercoil
D:inverted L shape
E:polyA sequence
答案: 【
inverted L shape
】

7、 问题:3′-end of mRNA has （ ）
选项：
A:double-stranded helix
B:regional double-stranded helix
C:supercoil
D:inverted L shape
E:polyA sequence
答案: 【
polyA sequence
】

8、 问题:The RNA that can carry amino acid and transfer it to ribosome is （ ）
选项：
A:tRNA
B:mRNA
C:rRNA
D:hnRNA
E:siRNA
答案: 【
tRNA
】

9、 问题:The template of protein synthesis is （ ）
选项：
A:tRNA
B:mRNA
C:rRNA
D:hnRNA
E:siRNA
答案: 【
mRNA
】

10、 问题:DNA can be separated into two single chains during heating （ ）
选项：
A:Hydrolysis of nucleic acid
B:Dissociation of nucleic acid
C:DNA denaturation
D:DNA renaturation
E:Hybridization
答案: 【
DNA denaturation
】

第三章 单元测试

1、 问题:Which of following is correct about enzyme?（ ）
选项：
A:all enzymes are proteins
B:enzymes can not be updated in living tissue
C:enzymes are biocatalysts that catalyze the multiple dynamic processes in the body
D:the substrates of enzyme are all organic compounds
E:catalytic DNA and RNA are not biocatalysts
答案: 【
enzymes are biocatalysts that catalyze the multiple dynamic processes in the body
】

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