otic cells from smallest to largest size
【作业】第三单元 基因和染色体-2（基因概念的多样性） Chapter 2 Gene and Chromosome_ Homework
1、 问题:请上传Chapter 2 Gene and Chromosome上直播课和慕课过程中所记的笔记（可以是提纲式或是思维导图，需要记录重点和难点，特别要记录下英文PPT中的专业单词，笔记请纸质记录，拍照后上传） 要求：1. 有章节题目；2. 要点大纲；3. 记录下重点难点；4. 可以用思维导图式；5. 记录下英文专业词汇；6. 不能出现个人信息。
评分规则: 【 100-99：有章节题目和要点大纲，逻辑清楚，内容完整详细，重点难点突出，有记下英文专业词汇，且书写工整；90-89： 有章节题目和要点大纲，逻辑清楚，内容完整，有重难点，但不突出，只有少数英文词汇；书写工整；80-79：有章节题目和要点大纲，逻辑清楚，但内容和重难点不够完整，没有英文词汇，书写不够工整；70-69：有章节题目，但是逻辑不清楚，但内容和重难点不够完整，没有英文词汇，书写不工整，版面很乱60：有交笔记，但是内容非常让人不满意。0：没有提交笔记
】
第三单元 基因和染色体-2（基因概念的多样性） Chapter 2 Gene and Chromome _ Test
1、 问题:Watson & Crick won the noble prize in 1962 for their discoveries concerning:
选项：
A:the interaction between tumour viruses and the genetic material of the cell
B:the mobile genetic elements
C:the molecular structure of nucleic acids
D:the invention of the PCR method
答案: 【the molecular structure of nucleic acids】
2、 问题:Most of the stability of the double-stranded DNA structure is the result of
A: hydrogen bonding between purines.
B:the phosphodiester backbone.
C:the angle of the planes of the bases with respect to the helix axis.
D:the stacking interactions between base pair.
答案: 【the stacking interactions between base pair.】
3、 问题:It is easier to melt DNA richer in AT than GC because
选项：
A:it is more heat sensitive.
B:there is one less hydrogen bond in an AT base pair
C: the helix pitch is longer in AT rich regions.
D:All of the three statements.
答案: 【there is one less hydrogen bond in an AT base pair】
4、 问题:As B-DNA is gradually heated， the absorbance at 260 nm
选项：
A:increases.
B:decreases.
C:stays the same.
D: It is unpredictable.
答案: 【increases.】
5、 问题:What are the target and the probe of the Southern blotting？
选项：
A:DNA， DNA
B:RNA， RNA
C:Protein， antibody
D: None of the above.
答案: 【DNA， DNA】
6、 问题:Supercoiling of pure circular DNA is a result of __.
选项：
A:underwinding or overwinding of the helix
B:the long length of the strands
C:the lack of associated histones
D:the activity of exonucleases
答案: 【underwinding or overwinding of the helix】
7、 问题:Which of the following is an example of highly-repetitive DNA?
选项：
A:Globin gene family
B:Histone gene cluster
C:Minisatellite DNA
D:rDNA gene family
答案: 【Minisatellite DNA】
8、 问题:Histones are found in close association with DNA. Which of the following statements is incorrect?
选项：
A:A nucleosome core is composed of ~146 bp of DNA and a histone octamer.
B:Histone H1 binds to linker DNA.
C:There are only four types of histones.
D:Nucleosomes are evenly distribution within chromatin.
答案: 【There are only four types of histones.】
9、 问题:DNA wraps around an octamer of histones to form bead-like structures called __.
选项：
A:nucleoids
B:nucleosomes
C:nucleoli
D:chromatids
答案: 【nucleosomes】
10、 问题:What is the approximate diameter of a chromatin fiber?
选项：
A:3 nm
B:30 nm
C:300 nm
D:3 mm
答案: 【30 nm】
11、 问题:What is the order of packaging of chromatin in eukaryotic cells from smallest to largest size?
选项：
A:double-helix → solenoid螺线管 → nucleosome → chromosome
B:double-helix → chromatin → solenoid → chromosome
C:single-stranded DNA → chromatin → histones → chromosome
D:double-helix → nucleosomes → solenoid → chromosome
答案: 【double-helix → nucleosomes → solenoid → chromosome】
12、 问题:How might mitochondrial DNA be distinguished from eukaryotic nuclear DNA?
选项：
A:Mitochondrial DNA is in the Z conformation， nuclear DNA is in the B conformation.
B:Mitochondrial DNA is methylated， nuclear DNA is not.
C:Nuclear DNA is linear， mitochondrial DNA are circular.
D:They cannot be distinguished and must be clearly separate during purification
答案: 【Nuclear DNA is linear， mitochondrial DNA are circular.】
13、 问题:Which of the following statements is not correct concerning to the prokaryotic genome and eukaryotic genome?
选项：
A:There are many non-coding DNAs in eukaryotic genome.
B:DNA are almost naked in prokaryotes.
C:There are many operons in eukaryotic genome.
D:Prokaryotic genome is a single circular DNA molecule.
答案: 【There are many operons in eukaryotic genome.】
14、 问题:Which does not apply to most bacterial DNA?
选项：
A:Circular.
B:Relaxed.
C:Not packed into nucleosomes.
D:Supercoiled.
答案: 【Relaxed. 】
15、 问题:In a nucleic acid molecule， nucleotides are joined into a polymer by the __ phosphodiester bonds.
选项：
A:2′，3′
B:2′，4′
C:3′， 4′
D:3′， 5′
答案: 【3′， 5′】
16、 问题:All genomes are composed of DNA.
选项：
A:正确
B:错误
答案: 【错误】
17、 问题:The two strands of double-stranded DNA have the same content of each of the bases A， T， G and C.
选项：
A:正确
B:错误
答案: 【错误】
18、 问题:The supercoiling of double-stranded circular DNA can be removed by cleaving a single phosphodiester bond on only one strand (nick).
选项：
A:正确
B:错误
答案: 【正确】
19、 问题:Prokaryotic DNA is organized into protein-DNA structures called nucleoids.
选项：
A:正确
B:错误
答案: 【正确】
20、 问题:Histone H1 is part of the histone octamer.
选项：
A:正确
B:错误
答案: 【错误】
21、 问题:Heterochromatin make up most of the genome.
选项：
A:正确
B:错误
答案: 【错误】
22、 问题:The maximum C-value is always greater than minimum C-value in an organism.
选项：
A:正确
B:错误
答案: 【错误】
【作业】第四单元 DNA的复制 Chapter 3 DNA replication-homework
1、 问题:请上传Chapter 3 DNA replication上直播课和慕课过程中所记的笔记（可以是提纲式或是思维导图，需要记录重点和难点，特别要记录下英文PPT中的专业单词，笔记请纸质记录，拍照后上传） 要求：1. 有章节题目；2. 要点大纲；3. 记录下重点难点；4. 可以用思维导图式；5. 记录下英文专业词汇；6. 不能出现个人信息。
评分规则: 【 100-90：有章节题目和要点大纲，逻辑清楚，内容完整详细，重点难点突出，有记下英文专业词汇，且书写工整；89-80： 有章节题目和要点大纲，逻辑清楚，内容完整，有重难点，但不突出，只有少数英文词汇；书写工整；79-70：有章节题目和要点大纲，逻辑清楚，但内容和重难点不够完整，没有英文词汇，书写不够工整；69-61：有章节题目，但是逻辑不清楚，但内容和重难点不够完整，没有英文词汇，书写不工整，版面很乱60：有交笔记，但是内容非常让人不满意。0：没有提交笔记
】
第四单元 DNA的复制 Chapter 3 DNA replication -test
1、 问题:All of the following statements about DNA replication in prokaryotes are true except:
选项：
A:DNA replication is conservative.
B:DNA synthesis occurs in the 5’ to 3’ direction.
C:Requires a 3’OH to initiate replication which is provided by an RNA primer.
D: DNA replication initiate from specific origin.
点击这里，查看后续答案①
点击这里，查看后续答案②（阿布查查更好用）
? 选项： A:double-helix → solenoid螺线管 → nuc