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习题练习:Unity and Diversity A.2 Nucleic Acids



 作者: admin   总分: 31分  得分: _____________

答题人: 匿名未登录  开始时间: 23年07月31日 09:58  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Statements below show three double-stranded nueqhvit7 z k;e5jv0t3:cleotide sequences. Which of these 7evj 3ev;ktt i0:5qhzsequences of base pairs is possible in a DNA molecule?

I. 5’- GGA CAG AGC -3’
3’- CCT GTC TCG -5’


II. 5’- GGA CAG AGC -3’
3’- TTC ACT CTA -5’


III. 5’- AGG GAC CGA -3’
3’- TCC CTG GCT -5’

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diagram below shows the structure based l( g/kb*ho+k5 pr0opmon the tetranucleotide hypothesis proposed by Levene that DNA was made up of equal amounts of adenine, guanine, cytosine and thpk o*lb+o5/rp0k( gmhymine. This hypothesis was a problem of induction, because it was based on a limited set of data. Subsequent evidence and data revealed a more complex and accurate understanding of the structure, leading to the falsification of the initial hypothesis.


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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the main role of the ribosow3ej8inr8 k xtnvc(r72/sga )mes labelled in the micrograph?


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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A strand of nucleotides reads CCUAGAGCUUACCG. Which type of pentose c hf7c71+ula4out6 h psugar could be found in the nucleotidesla6+ cupc 1ohf7 ut7h4 in this strand?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following processes is most du h4g:g* e-qip)t +sxmirectly involved in the formation of nucleic acids suue m:q)g- 4tipgh* x+sch as DNA?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What distinguishes uracil from thymine?o9 s s2wpp szuao 5n9w;;vnwt zl 2m:z/98n5um

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which statements are characterist8vp -)xez-ff zwxq9 1eics of a DNA molecule?
I. The two strands are identical.
II. The two strands are antiparallel to one another.
III. The sugar-phosphate backbone is held together by covalent bonds.

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The table shows the nucleotide base sequence and genome size (nsdks1uaf jbl:7e qp,,f,f 9b7umber of base pairs, bp) 7 l7, fkf:e,jp1b9dsqb asf,ufor different species.

Which conclusion can be drawn, based on the table?

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How does the genetic code provide evidence of universal common ancestry?4iattn d/ vjao/dh s oq.:.h(s-dmv) (

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diagram depicts nucygb1)3g*a cpwsi4ku9h a q7.kleosomes.



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11#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Gel electrophoresis is a technique often used to analyse DNA mokf f++ lgq2f(3vtjf* vlecules. It includes a gel and an electric field. The diagram below shows the outcome of gel electrt * ++g(ff3kflvjvqf2ophoresis.


1.DNA is a type of nucleic acid. State one location where DNA is found in cells.

2.Deduce, with a reason, which direction the DNA fragment moves through the gel.

3.Distinguish between the functions of DNA and RNA in unicellular organisms.
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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diagram below shows pre-mRNeya7y yl.2 s1,rk1 6zmat4f mlA and three mature mRNA transcripts where the introns have been removee4a 6yl,7 am 1ks.mftlz12yyr d.



What is an advantage of the above process?

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following jxw zyhe)3h i7i/21we is a similarity between transcription and translation?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diagram shows the structure of aaxswt/hhz /7d-d p ,k2 DNA fragment. Which bonds easily break and h/,dxtw2pkasd7 /z h- reform?



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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What would make one DNA molecule more stable than l3bfj)w79dm (4ra iwb9n mo0plx yu). another DNA molecule?
I. More G-C base pairs than A-T base pairs
II. More hydrogen bonds between base pairs
III. Greater distance between A-T base pairs than G-C base pairs

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Hershey and Chase conducted an rms;,aee3 7zr.u6bg 5u j(gc xexperiment to investigate whether DNA or protein serves as the genetic materia e(xeg3ur 5z a6.7jur;sbmg,cl. They cultured 2 batches of viruses, one in a medium containing radioactive $^{35}S$ and one in radioactive $^{32}P$. They then introduced each batch of viruses to separate cultures of bacteria. After allowing time for the viruses to infect the bacteria, the culture solutions were centrifuged to separate the viral remains from the bacterial cells, forming two layers, the pellet and the supernatant.


Which component of the tube would provide evidence that DNA is the genetic material?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which function and process are correctly mat(05xxl rkor: b0xno)qched in the table below?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which statement highlights the importance o5xr1a v;kj1 u6l*9uwvw 1uhwh 6erp-qf nucleosomes in DNA supercoiling ?

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The image shows many ribosqwiayne;e z/ +72 apz4omes on a mRNA molecule. How many unique polypeptide chains are being trany2 p a w;ziq7na/ee4+zslated?


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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the labelled u5lon3 z h4xq0k v5six e0a-;zstructures shows the correct directionality of the DNA molecuz4ln 5 kv zxx0 50hi-aoqs;3uele?







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21#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
The diagram below shows the structure of DNA nucleotivera6cvt6uw 5+ y ub(*des.

1.State the component of DNA that is attached at position X.

2.Identify the type of bonding shown as dotted lines in the diagram.

3.The 5’ and 3’ linkages in DNA play an important role in replication, transcription and translation.

3.1.On the diagram, label the 5’ prime and 3’ prime ends on both strands to show the direction of the DNA.

3.2.Outline how the processes of transcription and translation occur with regards to the formation of 5’ and 3’ linkages.

4.Explain how the DNA helix maintains its stability.

5.Erwin Chargaff’s data on the relative amounts of purine and pyrimidine bases played an important role in determining the structure of DNA.

5.1.Outline how Chargaff’s data contributed to our understanding of the structure of DNA.

5.2.State a proposed model of DNA that was falsified by Chargaff's data.
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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
The Hershey-Chase experiment 6uxii)qq.nl: in 1952 involved cultured viruses that were radioactivel:6iun q.iq)xl y labelled with either sulfur ($^{35}$S) or phosphorus ($^{32}P) in two separate flasks. Each batch of viruses was then added to separate cultures of bacteria. After allowing time for the viruses to infect the bacteria, the culture solutions were centrifuged to separate the viral remains from the bacterial cells, forming two layers, the pellet and the supernatant.


1.State reasons for using radioactive sulfur ($^{35}$S) and phosphorus ($^{32}$P).

2.Suggest one technological development, other than radioisotopes, that helped open up possibilities in understanding the overall structure of DNA.

3.1.Outline the results of the experiment that provided evidence to support the conclusion that DNA is the genetic material.

3.2.Describe how the 4 nitrogenous bases of DNA enables polypeptides to be coded for.

4.Explain how DNA can be packaged into compact units to form chromatin.
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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What bases are P, Q, and R if S is a pyrimidine? d: z5obt*/gpb




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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How did radioisotopes help make the investigations by Hershey and Chase pqq 211kr )3s 7hih9 l e+bz4kabka),8zuu vvjpossible?k bv )+9p8su ql321jabrzu qiehk hk7 a,v1)z4

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What feature of the DNA molecule was utilised by Hershey and Chase in order t ic .q3ov iii pvy0hfbnh4um4**hx7*2o identify that viral DNA is able to enter host cells, but most of their protein is no4uvfipvo 32.0h nc7**hibxhm*4i qyi t?

.

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26#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
The image below show 2x-8e,m :arkx vqn,dps a short fragment of the DNA molecule.



1.Suggest one possible outcome if DNA consisted of two parallel strands instead of two antiparallel strands.

2.The structure of DNA is described as being a 'double helix'. Explain how this structure is related to the DNA function.

3.Compare and contrast the nitrogenous bases thymine and uracil.
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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following shows the correct components of one nucleosome?rl8yw:0 5rmeti 3znm(11yua-5kz jp q

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Hershey and Chase conducted experiments using the rawahv h29t43mgdioactive isotopes $^{35}$S and $^{32}$P which demonstrated that DNA is the genetic material. What would they have observed about the distribution of isotopes in the centrifuged sample if protein, rather than DNA, were the genetic material?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The graph below shows the results omqz c2ox 21gqzmqn*+2f an experiment conducted by a team of researchers investigating the relationship between the composition and melting point of different DNA samples. At the melting po 2m1g+qqxcz q 2om2n*zint, the DNA double helix separates into two individual strands.

Two DNA samples were compared, one consisting of only PQ pairs and another one consisting of only RS pairs. Letters P, Q, R and S represent different nitrogenous bases found in the DNA.


Based on the results presented in the graph, and your knowledge of nucleotide base pairing (between purines and pyrimidines), deduce which nitrogenous bases correspond to the letters P, Q, R and S.

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30#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
DNA and RNA are nucleic acids that are essential to all living organisms. * +m0,wuqcaurj/h. g b
1.Draw and label a diagram of a nucleotide.

2.Explain how the variation in base sequences leads to the ability of DNA to have an enormous capacity for storing genetic information.

3.DNA is a polymer of nucleotides. Describe the structure of DNA.
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31#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
The image below shows r3qn/hbod9 dmv2m9g5 (ev p(s a short fragment of the DNA molecule.


1.Suggest one possible problem that could arise if DNA consisted of two parallel strands instead of two antiparallel strands.

2.State one place where DNA is found in cells.

3.Compare and contrast the structure of DNA and RNA.
参考答案:    

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