第一章 单元测试

1、 问题:Which set of amino acids can absorb 280 nm UV light? （ ）
选项：
A:Thr & His
B:Trp & Tyr
C:Cys & His
D:Glu & Asp
E:Met & Cys
答案: 【
Trp & Tyr
】

2、 问题:Which of the following amino acids is involved in the formation of disulfide bridge?（ ）
选项：
A:methionine
B:hydroxyproline
C:tryptophan
D:tyrosine
E:Cysteine
答案: 【
Cysteine
】

3、 问题:The formation of protein secondary structure is mainly dependent on（ ）
选项：
A:hydrogen bond
B:disulfide bond
C:hydrophobic packing
D:base-stacking interaction
E:peptide bond
答案: 【
hydrogen bond
】

4、 问题:Essential of protein denaturation is （ ）
选项：
A:break of peptide bonds
B:rupture of hydrogen bonds
C:break of non-covalent bonds
D:damage of primary structure
E:rupture of disulfide bond
答案: 【
break of non-covalent bonds
】

5、 问题:The amino acid which does not exist in natural proteins is （ ）
选项：
A:cysteine
B:citrulline
C:methionine
D:glycine
E:lysine
答案: 【
citrulline
】

第二章 单元测试

1、 问题:The base is found in mRNA but not in DNA is （ ）
选项：
A:G
B:C
C:A
D:T
E:U
答案: 【
U
】

2、 问题:If the content of adenine is 15% in a DNA double helix, that of cytosine is （ ）
选项：
A:15%
B:35%
C:55%
D:75%
E:85%
答案: 【
35%
】

3、 问题:Which of the following statements about nucleosome structure is correct? （ ）
选项：
A:Nucleosomes are spherical structures comprised of RNA, nonhistone proteins and histone proteins.
B:The major histones comprising nucleosomes are H1 and H4.
C:Nucleosomes permit efficient packing of DNA to about one seventh its normal volume.
D:The histone associated with the DNA in the linker region holding nucleosomes is called H2A.
E:All of the above.
答案: 【
Nucleosomes permit efficient packing of DNA to about one seventh its normal volume.
】

4、 问题:The codon in mRNA reversely complementary pairing with anti-codon UGC in tRNA is （ ）
选项：
A:ACG
B:AUG
C:GCA
D:GCT
E:TCG
答案: 【
GCA
】

5、 问题:The 5′end of mRNA in most eukaryotes has （ ）
选项：
A:SD sequence
B:Cap structure
C:poly A tail
D:initiation codon
E:-CCA sequence
答案: 【
Cap structure
】

第三章 单元测试

1、 问题:The specificity of enzyme is determined by （ ）
选项：
A:coenzyme
B:prosthetic group
C:apoprotein
D:metal ion
E:Substrate
答案: 【
apoprotein
】

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