2024知到答案 分子生物学（Molecular Biology)（山东联盟） 完整智慧树网课章节测试答案
第一章 单元测试
1、单选题：
The Nucleic acid will get maximum UV absorbance at wavelength_____（ ）
选项：
A:230nm
B:260nm
C:280nm
D:270nm
答案: 【260nm】
2、单选题：
The common component composed of DNA and RNA is _____（ ）
选项：
A:Guanine
B:D-ribose
C:D-2-deoxyribose
D:Thymine
答案: 【Guanine】
3、单选题：
The secondary structure of DNA is _____（ ）
选项：
A:α-helix
B:double helix
C:β-turn
D:β-sheet
答案: 【double helix】
4、单选题：
The corresponding anticodon to codon ACG is___ （ ）
选项：
A:CGT
B:UGC
C:GCA
D:CGU
答案: 【CGU】
5、单选题：
Single strand DNA 5’-CGGTA-3’ can anneal with the follow RNA _____（ ）
选项：
A:5’-TAGGC-3’
B:5’-UACCG-3’
C:5’-GCCAT-3’
D:5’-GCCAU-3’
答案: 【5’-UACCG-3’】
6、单选题：
mRNA is used as _____ in translation.（ ）
选项：
A:template
B:adaptor
C:machinery
D:None
答案: 【template】
7、单选题：
Amount of T in RNA is 0.25mol，so amount of A is_____. （ ）
选项：
A:0.5mol
B:1.00mol
C:0.75mol
D:0.25mol
答案: 【0.25mol】
8、多选题：
tRNA in eukaryotic cell contains _____（ ）
选项：
A:18sRNA
B:28sRNA
C:5sRNA
D:5.8sRNA
答案: 【18sRNA;
28sRNA;
5sRNA;
5.8sRNA】
9、多选题：
The base in DNA _____（ ）
选项：
A:G
B:C
C:T
D:A
答案: 【G;
C;
T;
A】
10、判断题：
Stem-loop is a type of secondary structure not usually found in tRNA.（ ）
选项：
A:对
B:错
答案: 【对】
11、判断题：
All genomes are composed of RNA.（ ）
选项：
A:对
B:错
答案: 【错】
第二章 单元测试
1、单选题：
Sequences that are removed from the primary RNA transcript in eukaryotes are called________.（ ）
选项：
A:introns
B:operons
C:exons
D:mRNA
答案: 【introns】
2、单选题：
Which character is not true for eukaryotic genes?（ ）
选项：
A:There is a highly conserved sequence at the junction of exon and intron.
B:Genes of rRNA and some tRNA have introns too.
C:Eukaryotic gene structure is discontinuous
D:All the protein-coding genes in higher eukaryotes have introns.
答案: 【All the protein-coding genes in higher eukaryotes have introns.】
3、单选题：
Which is not a feature of enhancer？（ ）
选项：
A:A gene often has only one enhancer.
B:It can enhance the promoter in any direction and at any location
C:The distance between enhancer sequences and regulated genes varies a lot.
D:Sometimes enhancer sequences can also be located within introns.
答案: 【A gene often has only one enhancer.】
4、多选题：
The regulators of eukaryotic gene expression consist of________.（ ）
选项：
A:promoter
B:silencer
C:insulator
D:enhancer
答案: 【silencer;
insulator;
enhancer】
5、判断题：
All housekeeping genes have weak promotors and are regulated to maintain their geneproducts at constant low level concentrations.（ ）
选项：
A:错
B:对
答案: 【错】