Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 3, Problem 14RQ
Cholesterol is an integral part of plasma membranes. Based on its structure, where is it found in the membrane?
- on the extracellular surface
- embedded with the phospholipid heads
- within the tail bilayer
- attached to the intracellular surface
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Cholesterol is an integral part of plasma membranes. Based on its structure and
characteristics, where is it found in the membrane?
O on the extracellular surface
Owithin the tail portion of the bilayer
O attached to the intracellular surface
O embedded with the phospholipid heads
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Lipid rafts form because membrane component such as sphingolipids and cholesterol molecules
preferentially associate with another. Why do you think that the aggregates are limited in size?
Which of the following is a true statement?
Sphingolipids contain 2 hydrophobic, acyl chains
Phospholipids contain 3 hydrophobic acyl chains
Sphingolipids are completely no-polar, hydrophobic molecules
The different types of phospholipids do not have different physical properties when in the membrane
Chapter 3 Solutions
Biology 2e
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- Which of the following statements are acceptable and why? [Whereas all the carbohydrate in the plasma membrane faces outward on the external surface of the cell, all the carbohydrate on internal membranes faces toward the cytosol.] [Although lipid molecules are free to diffuse in the plane of the bilayer, they cannot flip-flop across the bilayer unless enzyme catalysts called phospholipid translocators are present in the membrane.]arrow_forwardA cholesterol molecule consists of a polar region (shown in white) and a nonpolar region (shown in blue). The diagrams below show several possible orientations of a cholesterol molecule in a phospholipid bilayer. Which seems most reasonable? Cholesterolarrow_forwardWhat is the role of cholesterol in the cell membrane? It converts cis bonds of fatty acids to trans. It allows for the formation of micelle structures. It attracts to the polar phospholipid heads. It reduces membrane fluidity.arrow_forward
- Why should triacylglycerol be insignificant component of plasma membrane ?arrow_forwardPhospholipids (Which is charged, what is the functional significance? Are they preferentially located on cytosolic or extracellular lipid monolayer? What is the functional significance of plasma membrane asymmetry?)arrow_forwardPhospholipids are usually described as being able to diffuse freely through a lipid membrane. What are the types of movements allowed for phospholipids are what are different limits to movement of phospholipids in the membranearrow_forward
- The plasma membrane is composed of a variety of lipid molecules. 1. Phosphatidylethanolamine 2. Phosphatidylcholine 3. Phosphatidylinositol 4. Phosphatidylserine 5. Sphingomyelin 6. Glycolipids 7. Cholesterol. Which lipids contain sugar molecules?arrow_forwardWhich of the following describes the function of cholesterols in plasma membranes to help regulate cell transport? Cholesterols are mainly responsible for cell signaling and cell recognition. Cholesterols act as fluidity buffer that make the membranes more fluid at higher B) temperatures and less fluid at lower temperatures. Cholesterols act as fluidity buffer that make the membranes less fluid at higher temperatures and more fluid at lower temperatures. Cholesterols in the phospholipid bilayer increase the membrane's permeability to ions and small molecules.arrow_forwardIf the phosphoglycerolipids constituting the framework of the plasma membrane, these are what give it its functions. There are two main classes of membrane proteins: intramembrane proteins and peripheral protections. What is the distinction between intramembrane and peripheral proteins.arrow_forward
- A phospholipid bilayer with equal amounts of saturated and unsaturated fatty acids displays a specific permeability to glucose. What effect will increasing the proportion of unsaturated fatty acids in the bilayer have on the membrane's permeability to glucose?arrow_forwardAccording to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids? They frequently flip-flop from one side of the membrane to the other. They have hydrophilic tails in the interior of the membrane. They can move laterally along the plane of the membrane. They are free to depart from the membrane and dissolve in the surrounding solution.arrow_forwardFor the lipids within the bilayer that comprise the plasma membrane: O The hydrophilic ends face outside (extracellular/exoplasmic face) and inside (cytoplasmic face) of the cells, with hydrophobic ends buried in the center of the lipid bilayer. The hydrophobic ends face outside (extracellular/exoplasmic face) and inside (cytoplasmic face) of the cells, with hydrophilic ends buried in the center of the lipid bilayer. The hydrophilic ends face the outside (extracellular/exoplasmic face) of the cells and the hydrophobic ends face inside (cytoplasmic face) of the cells. O Hydrophobic and hydrophilic ends face outside (extracellular/exoplasmic face) and inside (cytoplasmic face) of the cells randomly. The hydrophobic ends face the outside (extracellular/exoplasmic face) of the cells, the hydrophilic ends face inside (cytoplasmic face) of the cells.arrow_forward
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