Which One is NOT TRUE about membranes? a. Membranes rich in fatty acids containing one or more double bonds are more fluid than membranes with no double bonds in fatty acids. b. If cholesterol is present in membranes, the fluidity of membranes will be reduced at moderate and warm temperatures. c. If cholesterol is present in membranes, the fluidity will remain intact at low temperatures. d. If the fatty acids with double bond are present in membranes, the membrane will be viscous.

Which One is NOT TRUE about membranes? a. Membranes rich in fatty acids containing one or more double bonds are more fluid than membranes with no double bonds in fatty acids. b. If cholesterol is present in membranes, the fluidity of membranes will be reduced at moderate and warm temperatures. c. If cholesterol is present in membranes, the fluidity will remain intact at low temperatures. d. If the fatty acids with double bond are present in membranes, the membrane will be viscous.

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter3: Cell Structure And Function

Section: Chapter Questions

Problem 11RQ: The tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a....

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3) For each case given below, describe how the fluidity of membranes will change (increase or decrease) and why this change will happen. A. Increasing the number of double bonds (unsaturation) of the fatty acids in the phospholipids. B. Increasing the length of the fatty acid chains. C. Increasing the cholesterol content of the membrane D. Increasing temperature
Which of the following statements is CORRECT about the fatty acid residues in membrane lipids? A. Whole swathes of the membrane have higher saturated residues to increase the overall surface tension. B. There are more unsaturated units to maintain the fluidity of the structure at all environmental temperatures. C. More unsaturated residues are present to increase the melting point of the membrane making it resilient. D. Larger quantities of saturated units are present to maximize stacking and provide effective barrier capacity.
How does cholesterol affect membrane fluidity? Group of answer choices a. It tends to increase the fluidity b. It has no influence on membrane fluidity c. It tends to decrease membrane fluidity
Which of the following does not apply to lipid asymmetry? a.It arises in the endoplasmic reticulum. b.It arises due to the flip-flop movement of specific phospholipids to the cytosolic monolayer. c.It is preserved throughout vesicular transport. d.It depends on the activity of flippase.
. Cholesterol is an integral part of plasma membranes.Based on its structure, where is it found in themembrane?a. on the extracellular surfaceb. embedded with the phospholipid headsc. within the tail bilayerd. attached to the intracellular surface
The presence of cholesterol regulates the in animal cells. Ca. fluidity of a membrane b. polarity of a membrane c. structure of a membrane
What is the role of cholesterol in animal cell membranes? A. Blocks the association of the fatty acyl chains of phospholipids at high temperature. B. Is a receptor site for hormones on the surface of membranes. C. Broadens the temperature range of optimum membrane fluidity. D. Aids in the transport of small hydrophobic molecules across the membrane. A fatty acid designated as 20:0 is ________, while one that is designated 20:3 delta ^5,8,11 is ________. A. complex; simple B. unsaturated; saturated C. saturated; unsaturated D. simple; complex E. monounsaturated; polyunsaturated
A fish swims into cold water. How should it regulate so that the cell membrane continues to have the same fluidity as usual? (more than one answer may be correct) which are correct a.increase the length of lipids with short hydrocarbon tails b.increase the number of steroids in the cell membrane c.more saturated lipids in the membrane d.reduce the proportion of lipids with short hydrocarbon tails e.more unsaturated lipids in the cell membrane
Which of the following statements is correct? A. Short-chain fatty acids have higher transition temperatures than do long-chain fatty acids making membranes enriched in shor chain fatty acids less fluid. B. Long-chain fatty acids have higher transition temperatures than do short-chain fatty acids making membranes enriched in long chain fatty acids more fluid. C. Long-chain fatty acids have higher transition temperatures than do short-chain fatty acids making membranes enriched in long- chain fatty acids less fluid D. Short-chain fatty acids have higher transition temperatures than do long-chain fatty acids making membranes enriched in short- chain fatty acids more fluid. B OD OC OA O All are incorrect
Which statement is NOT correct concerning the cell membrane? 1. The fatty acid hydrophobic "tails" are contained within what becomes a double- layered molecule. 2. This molecule provides an impermeable barrier for the cell from the watery outer environment. 3. The overall structure of the cell membrane results from the amphiphilic phospholipid molecules. 4. Because of the hydrophilic property of the phosphate containing "head", this "head* orients itself toward the "watery." cytoplasm and the extracellular fluid.
Why do phospholipids tend to spontaneously orient themselves into something resembling a membrane such as the lipid-bilayer sphere, single-layer lipid sphere, and lipid-bilayer sheet? a. Phospholipids are amphipathic molecules. The polar head faces towards water and the nonpolar fatty acid tails face towards other fatty acid tails. b. Phospholipids are lipophilic molecules. The polar head faces towards water and the nonpolar fatty acid tails face towards other fatty acid tails c. Phospholipids are amphipathic molecules. The nonpolar head faces towards other fatty acid tails and the polar fatty acid tails face towards water. d. Phospholipids are hydrophilic molecules. The polar head faces towards water and the nonpolar fatty acid tails face towards other fatty acid tails.
Which of the named factors might induce bending of membranes? Select one: O a. Cylindrically shaped lipids O b. Carbohydrates C. Conically shaped proteins O d. Cylindrically shaped proteins