30 In order for animal cell plasma membranes to function correctly they must exhibit fluidity. Which of the below statements regarding the fluidity of animal cell plasma membranes are CORRECT? i. Phospholipids containing unsaturated fatty acids can be incorporated into the plasma membrane to help maintain fluidity. ii. Many proteins embedded in the cell membrane can move laterally through the phospholipid bilayer. iii. Cholesterol acts as a fluidity buffer by reducing fluidity at moderate temperatures and by reducing solidification of the phospholipid fatty acids at low temperatures. iv. Phospholipids flip between the inner and outer layers of the membrane bilayer more frequently than they flip laterally with phospholipids that neighbour them in the same layer. Select one alternative: Oi, ii and iv only Oi, ii and iii only Oii and iii only Oi and ii only

30 In order for animal cell plasma membranes to function correctly they must exhibit fluidity. Which of the below statements regarding the fluidity of animal cell plasma membranes are CORRECT? i. Phospholipids containing unsaturated fatty acids can be incorporated into the plasma membrane to help maintain fluidity. ii. Many proteins embedded in the cell membrane can move laterally through the phospholipid bilayer. iii. Cholesterol acts as a fluidity buffer by reducing fluidity at moderate temperatures and by reducing solidification of the phospholipid fatty acids at low temperatures. iv. Phospholipids flip between the inner and outer layers of the membrane bilayer more frequently than they flip laterally with phospholipids that neighbour them in the same layer. Select one alternative: Oi, ii and iv only Oi, ii and iii only Oii and iii only Oi and ii only

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter48: Regulating The Internal Environment

Section: Chapter Questions

Problem 8TYK

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13. Which of the following statements about membrane phospholipids is/are true? a) They are oriented within biological membranes with polar head groups facing the outsides of the membrane. b) Only if assisted by the appropriate enzymes, phospholipids in aqueous solution will form themselves into bilayers, which seal their edges by forming droplets. c) They can have different shapes depending on the presence of double bonds in their fatty acid tails. d) a and c e) a, b and c
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6. A carrot, when dried out, becomes soft. There is a way to make it firm and crisp. Explain how and why, using the following guidelines. a) Draw and label a representative cell of the carrot, in its dried state. Be precise in your drawing. b)Describe the type of extracellular solution that is appropriate to add to make the desired change (name and define what type of solution, the net movements of solvent and solutes, etc.). c)Draw a representative cell of the carrot, in its possible state after the change. Represent the movement of water using an arrow to indicate what has happened.