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, 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
. 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 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?
Chapter 3 Solutions
Biology 2e
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- The tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a. phosphate groups; hydrophobic b. fatty acid groups; hydrophilic c. phosphate groups; hydrophilic d. fatty acid groups; hydrophobicarrow_forwardCell membranes consist mainly of ________ and ________. a. lipids; carbohydrates b. phospholipids; proteins c. lipids; carbohydrates d. phospholipids; ECMarrow_forwardIn a lipid bilayer, the of all the lipid molecules are sandwiched between all of the __________. a. hydrophilic tails; hydrophobic heads b. hydrophilic heads; hydrophilic tails c. hydrophobic tails; hydrophilic heads d. hydrophobic heads; hydrophilic tailsarrow_forward
- Cell membranes consist mainly of a _________. a. carbohydrate bilayer and proteins b. protein bilayer and phospholipids c. phospholipid bilayer and proteinsarrow_forwardCell membranes consists mainly of ________ and ________ . a. lipids; carbohydrates c. lipids; phospholipids b. phospholipids; protein d. phospholipids; ECMarrow_forwardUsing the answer code on the right, indicate which membrane component is responsible for the function in question: 1. channel formation____________________________________ (a) lipid bilayer 2. barrier to passage of water- __________________ (b) proteins soluble substances ____________________________________ (c) carbohydrates 3. receptor sites 4. membrane fluidity 5. recognition of self 6. membrane-bound enzymes 7. structural boundary 8. carriersarrow_forward
- A phospholipid in cell membrane is an amphiphilic molecule, meaning it has both a hydrophilic region and a hydrophobic region. Suppose the phospholipid loses this property, what consequences will it bring to the cell.arrow_forwardHow is the structure of cholesterol similar to other membrane lipids? How is it different? Based on the figure below, suggest a function for cholesterol in biological membranes.arrow_forwardWhich 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 membranearrow_forward
- Lipid rafts are microdomains in the plasma membrane that function as a stable platform for signaling and trafficking. Which of the following helps make the lipid rafts more stable and less mobile? phospholipid cholesterol sphingolipid a and b b and carrow_forwardA membrane consists of 50% protein by weight and 50% phosphoglycerides by weight. The average molecular weight of the lipids is 800 Da, and the average molecular weight of the proteins is 50,000 Da. Calculate the molar ratio of lipid to protein.arrow_forwardThe cell membrane primarily consists of a collection of individual lipid molecules. Of the following three images, which one shows the correct orientation of these lipid molecules to form the cell membrane?arrow_forward
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The Cell Membrane; Author: The Organic Chemistry Tutor;https://www.youtube.com/watch?v=AsffT7XIXbA;License: Standard youtube license