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习题练习:Form and Function B.3 Membranes & Membrane Transport



 作者: admin   总分: 24分  得分: _____________

答题人: 匿名未登录  开始时间: 24年01月03日 19:31  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  
  The important properties of animal cell membranes351ejx ,eej juem5se3 are fluidity and permeability. Which molecule is responsible for enjesje 3 e1uxe,e3 5j5msuring the membrane’s fluidity?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which statement correctly describes th71 +qf2t yi7iokqtetkjuz5.3e cell membrane structure?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which structure represents a componavebm-f e6:2j h5qna :ent responsible for reducing membrane fluidity?jqb:5faave-: e26nm h



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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which component of the cell membrane7 cd3y7mq33xsdf 2r) bpecqs.1pj + im is represented by structure X?

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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 is not a function of cholesterol in cell membrrhk*t w0 i,qak*c;-nbanes?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diagram shows a plasma membrane. Which lett b 19p6m43*nd1j zjew ti;sahher indicates cholesterol?


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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of these membrane proteinsg3 fgun)j mr*,y)zbx )x:; zzb carry out active transport?

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8#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Neuronal cells have special membrane properties that allow t i*hnl.mna -7+bens .aheir axons to propagate action potential from oa7bmi. -* hn +na.lesnne cell to another. The diagram below shows a portion of an axonal plasma membrane.

1.1.State the role of a sodium-potassium pump in axon.
1.2.Describe the action of the sodium-potassium pump.
2.Distinguish between simple diffusion, facilitated diffusion and active transport.
3.Compare and contrast sodium-potassium pumps and potassium channels.
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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The diagram shows a polar bear (Ursus maritimus), which is native to the Arctigy6p*rfl5w un *qs+q*c. Which statement about the composition of its plasma mq65y** lw+rnfp u sgq*embranes is correct?



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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which allows cells to stick together t) kqqni+:7m . k7alsb:qd1ofo zkz5x+o form tissues?

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Some acetylcholine releasedfh0rl me ;8z,ts:f:m b by a motor neuron at the neuromuscular junction stimulates muscle contraction, while the remainder is rapidly removed from the synapse. Which,8lmf0 ;szr mfh:t :eb processes are required for this to happen?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  
Which structure on the above diagram corresponds to the molecule below?


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13#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
1.Outline the effects 5+.cs8g-lrpn4u/a b* tpr fg jof placing a liver cell in a hypotonic solution.
2.Outline how the fluidity of membranes allows materials to be taken into cells or to be released from cells.
3.Compare and contrast four types of membrane transport. Include an example of each.
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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following is not a function of membran 4i.gc 5:0dojtgxe f+ie proteins?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the structures beyx+g3 *8f )3io htgbqglow can transport water molecules across the cell membf38g3+ igbtg) *oqxyhrane?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which statement describes en s84 rhwyqahz;ugwn9a/(v )w4docytosis?

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17#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In an investigation ; o7bdi 8u,bt czcv+e3into the effect of solute concentration on diffusion rate, starch solutions, of varying concentrations, were placed inside starch permeable membrane balloons. Each balloon was put into a beaker of distilled water and at 3 minute intervals, samples were taken from the solution surrounding the membrane balloons in each beaker, placed on spotting tiles and tested for the presence of starch. The time taken for a positive test to show was recorded for eav cu ;3b+tzeo7 b8di,cch trial.


The results are shown in the graph.

1.1.Identify the dependent and independent variable in this investigation.

1.2.State one variable, other than time of testing, that should be kept constant in this investigation to ensure the results are valid.

2.Describe a positive test for starch.

3.Explain why the method used in this study would not be appropriate for an investigation into the effects of solute concentration on active transport.

4.1.Samples taken from the 5% and 10% starch solution both tested positive for starch after 3 minutes. Suggest a way in which the experiment could be improved to provide a more accurate result.
The accuracy of the experiment could be improved by    the frequency.

4.2.Predict the time taken for a positive starch test for a starch concentration of 3%.
A positive test for starch, at 3%, would take approximately    minutes.

5.Suggest modifications to the methodology that would make it suitable to investigate the effect of glucose concentration on the rate of diffusion.

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18#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The graph shows the results of an experiment on osmosis in,v tl3ud5etl .on lh02 potato tissue (Solanum tuberosum), cactus tissue (Carnegiea gigantea) and sunf ndl,hlt.uv0elo5 t32lower seeds (Helianthus annuus). Similar sized pieces of tissue were immersed in different solutions of sucrose for 30 hours.



1.Estimate the concentration of sucrose that is isotonic to the interior of the potato tissue.
The concentration of sucrose in the potato tissue is    mol dm$^{-3}$
2.Using the graph deduce, with a reason, the tissue that has the highest solute concentration.

3.Suggest one reason for the difference in internal solute concentration between the sunflower seed and cacti tissue.

4.The epidermis of the potato and cactus and the testa of the sunflowers seeds were removed. Suggest a reason for this.

5.Predict what the appearance of the cacti tissue would be like at 0.5 mol dm-3 sucrose solution.

6.1.State how percentage change in mass is calculated.

6.2.Explain why percentage change in mass is calculated rather than change in mass.

7.Explain why temperature has to be controlled in this study.

8.State one way in which this experiment could be made more reliable.

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How is the action of sodiuj 9tv2 yb:wo:qm-dependent glucose transporters in the small intestine, an example of indirect active q:j:tw voby92transport?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which type of transport is represented by this di.wl *n+ x-m7595nfo s)fq aysb1 yvqhyagram?


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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which row about the different methods of membrane transport is inw 0*gq0rwur( kcorrect?

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which evidence supported the Singeriijxq17qf sebp 1v) +8-Nicolson model of the plasma membrane?
I. Membrane fusion experiments revealed membrane proteins can diffuse from one position to another in the phospholipid bilayer.
II. Analysis of membrane proteins indicated that some surfaces of membrane proteins were hydrophobic.
III. Electron micrographs revealed the appearance of the membrane as two dark bands separated by a light band.

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23#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
1.Draw and label the fluid mosaic isi;/t5t6pg)jpmm) pmodel of a cell’s plasma membrane.

2.Distinguish between integral and peripheral proteins.

3.Compare and contrast the structure and function of glycoproteins and glycolipids in the plasma membrane.
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24#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
The table shows the results from a study on the percentage of cholesterol found-ggk:1zb w(ff in the cell membrane (b-f w 1:ggzkfof epithelial skin cells of different animals.

1.Calculate the mean percentage of cholesterol found in the cell membrane across all the animals listed in the table.
mean =__%
2.State one role of cholesterol in the cell membrane.
3.Suggest why arctic foxes have a greater mean percentage of cholesterol in their cell membranes than kangaroos.
4.Estimate, with a reason, the percentage of cholesterol that would be found in the cell membranes of polar bears.
5.Explain why the mass of cholesterol in the cell membranes is calculated as a percentage rather than a whole number.
6.Suggest why the cells studied may contain a higher percentage of cholesterol than shown in the table.
7.1Based on the data provided, suggest which animal in the study exhibits the highest fluidity in its epithelial skin cell membrane.
7.2Explain your answer to part (i).
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