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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 nucleotide se- p95dc2sl, yx 3kgdiu++5m 1x,bjjogc4ceae quences. Which of these sequences of base pairs is p bgd2m y3 j 5xu, -i+c9ke+lcoxgdp5,4cs ej1aossible 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 on the tetranucleoti fs8t xac+rz05de hypothesis proposed by Levene that DNA was made up of equal amounts of adenine, guanine, cytosine and thymine. 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 in0tcs5ax8fr z+ itial 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 thnz 6vsv.cgt xu e;uxo::z /p5;e ribosomes 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 aw5u/f4 y(z x;btf oey;cusqis*5x., of pentose sugar could be found in the nucleotides in thi b o5x y*f.s;, cs5twiuyzaf(/ ;euq4xs 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 directly inv:r*lze 03t 3nce/ ucpbolved in the formation of nucleic acids such asl:bc np*0z3 ceretu/ 3 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 ry:oa , h(tf7hfrom thymine?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which statements are charay:-n6,mtf6p idj)esloqq3b 9cteristics 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 nucleotid 30yukt-p:rkhe base sequence and genome size (number of base pairs, bp) fo -:pktkhyur 03r 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 c2ym m5(c;jtc y9; ypkooll;) fode provide evidence of universal common ancestry?

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diagram depicts nuc4dot+jbfy 5;-r5la e+a fw)lmleosomes.



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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 molecu,3ieolsmlq qb)/a :2m les. It includes a gel and an electric field. The diagram below shows the outcome of g3, abem qm:o/)2qlisl el electrophoresis.


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-mRNA and three matn1 j: e9f*k(ftch- xwjure mRNA transcripts where the introns have been removed.hk (9fx*c-efn 1tj wj:



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 is a similarity between t7,wq:tea 7iur ox. cg b0x44pwranscription 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 th8 9smv+sp.r ql +0lvqie structure of a DNA fragment. Which bonds easily break and refs8 9r +q lisv0.mlv+pqorm?



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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 more1rdxjknst7/bx- ; , me stable than 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 conducte)ywpk z645yjyd an experiment to investigate whether DNA or protein serves as the genetic material. They cultured 2 batches of virusez6pyj54ywk )y s, 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 z im8s70jmj0yun p 9tlxj7 58 l+aazb*are correctly matched 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 of nucleoso+ hhl:j5 j yq/tg+7un8kklnk/mes 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 ribosomes on a mRNA molecule. How many unique polypeptidey x4qfi9 h2/kt chains are being thqtyi42x/ k f9ranslated?


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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 structurab; nh67t7cv qx/r. yves shows the correct directionality of the DNA molechq y7tr6nv /xc ;b.7avule?







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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 )0d/e9s; x-fm mvg2kgozu(v jof DNA nucleotides.

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 in 1952 involved cultured viruses that were radioac5udq2pmi:s sxy3xqq8 :(n6zctively labelled with e 2ns8y qpxmqd3:cs 6u5zixq(:ither 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, ak.ptsu(ak wc r-/-r7wnd R if S is a pyrimidine?




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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 j(ha .hb ec15xio(-qqpossibleqibo(ch1 aej5q( -.hx?

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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 H0 onov,:3gfgrwn) b: wershey and Chase in order to identify that viral DNA is able to enter host celgf: o 3)n:wvrn0bwg,o ls, but most of their protein is not?

.

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26#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
The image below shows a iz vk+5 r7f6m/ g;lvuushort 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 nucle0 2gj .:;z uz8:3aq-dwkanhjlmm-q yf- xo-xr osome?

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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 radioactive it j3y,u4u n s;4o/rawuk,w;ul sotopes $^{35}$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 shows9gzh:ahl rk4 - 44dvmo the results of an experiment conducted by a team of researchers investigating the relationship between the composition and melting h:a 9mvz4okh -gr4l4dpoint of different DNA samples. At the melting point, 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 ar b 1di0 .6t*liydoimrm vwo.lv5l3v03e essential to all living organisms.
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 a short fragment of the DNA moleculedo9xuxsv qq;.vvko(x7 8 -p;u.c 9 gjg.


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.
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