BIOLOGY-TEXT
5th Edition
ISBN: 9781260169621
Author: BROOKER
Publisher: MCG
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Textbook Question
Chapter 5, Problem 3TY
Let’s suppose an insect, which doesn’t maintain a constant body temperature, was exposed to a shift in temperature from 60°F to 80°F. Which of the following types of membrane changes would be the most beneficial in helping the insect cope with the temperature shift?
- a. increase the number of double bonds in the lipid tails of phospholipids
- b. increase the length of the lipid tails of phospholipids
- c. decrease the amount of cholesterol in the membrane
- d. decrease the amount of carbohydrate attached to membrane proteins
- e. decrease the amount of carbohydrate attached to phospholipids
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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 following correctly describes the structure of the phospholipid bilayer in plasma
membranes?
The polar hydrophilic groups of each leaflet face outward, toward the aqueous
environment on either side of the membrane.
A
The non-polar hydrophobic groups of each leaflet face inward, toward each other.
The non-polar hydrophilic groups of each leaflet face outward, toward the aqueous
environment on either side of the membrane.
B
The polar hydrophobic groups of each leaflet face inward, toward each other.
The polar hydrophilic groups of each leaflet face inward, toward each each other.
The non-polar hydrophobic groups of each leaflet face outward, toward the aqueous
environment on either side of the membrane.
The non-polar hydrophilic groups of each leaflet face inward, toward each each other.
The polar hydrophobic groups of each leaflet face outward, toward the aqueous
environment on either side of the membrane.
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.
Chapter 5 Solutions
BIOLOGY-TEXT
Ch. 5.1 - Core Skill: Modeling The goal of this modeling...Ch. 5.2 - Prob. 1CSCh. 5.3 - Prob. 1CCCh. 5.3 - Prob. 2CCCh. 5.4 - Prob. 1CSCh. 5.4 - Prob. 2CSCh. 5.4 - Lets suppose the inside of a cell has a solute...Ch. 5.5 - What is the purpose of gating?Ch. 5.5 - Prob. 1EQCh. 5.5 - Prob. 2EQ
Ch. 5.5 - Prob. 3EQCh. 5.6 - What is the function of the protein coat?Ch. 5 - Prob. 1TYCh. 5 - Which of the following events can never be...Ch. 5 - Lets suppose an insect, which doesnt maintain a...Ch. 5 - Prob. 4TYCh. 5 - Prob. 5TYCh. 5 - Prob. 6TYCh. 5 - Prob. 7TYCh. 5 - Prob. 8TYCh. 5 - Prob. 9TYCh. 5 - Large particles or large volumes of fluid can be...Ch. 5 - With your textbook closed, draw and describe the...Ch. 5 - Prob. 2CQCh. 5 - Prob. 3CQCh. 5 - Prob. 1COQCh. 5 - With regard to bringing solutes into the cell...
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- Match the letters on the diagram below to the correct terms. 1. Glycoprotein E 2. Hydrophilic portion of a phospholipid 3. Glycolipid B 4. Hydrophobic portion of a phospholipid G 5. Peripheral membrane protein F 6. Hydrophobic portion of a transmembrane protein 7. Hydrophilic portion of a transmembrane protein Aarrow_forwardDiscuss the permeability of the phospholipid bilayer to the molecules and ions listed below. Is the bilayer freely permeable, somewhat permeable, or impermeable to each of these? 1. OH- 2. H* 3. 0₂ 4. C6H12O6 5. H₂O 6. CO₂ Which is not a major function of the protein in cell membranes? They are important for membrane transport They are important for cell-to-cell joining They function as enzymes They regulate membrane fluidity Which is not true about cell membranes? They frequently flip-flop from one side of the membrane to the other - They can move freely within one side of the bilayer Fatty acid tails of phospholipids form the membrane interior The interior of the bilayer is hydrophoicarrow_forwardAsaparrow_forward
- Which of the following is true about motion of membrane lipids? A. They can move most rapidly when in the gel phase. B. Lateral diffusion is catalyzed by flippase proteins. C. To increase the fluidity of membranes at low temperatures, cells synthesize more saturated fatty acids and fewer unsaturated fatty acids. D. Transbilayer diffusion involves the transfer of lipids from one face of the bilayer to another.arrow_forwardChoose all that aplly that are TRUE for the lipid bilayer:Negative mark is given to incorrect answer(s). a. The polar head groups of the bilayer are positively charged. b. Individual lipid molecules in one face (monolayer) of the bilayer cannot diffuse (flip-flop) to the other monolayer and must be catalyzed by a lipid transporter called flippase. c. The bilayer is stabilized by covalent bonds between neighbouring phospholipid molecules. d. Polar, but uncharged, compounds readily diffuse across the bilayer. e. Individual lipid molecules are free to diffuse laterally on the surface of the bilayer.arrow_forwardWhich is true about the phospholipid membrane? Group of answer choices: A. It is made up of phospholipid molecules which have a hydrophilic tail and a hydrophobic head B. It is made up of 4 layers of phospholipid molecules C. It is made up of phospholipids, which have a hydrophilic head and a hydrophobic tail D. It is made up mostly of proteins but has cholestrol molecules and phospholipids embedded within itarrow_forward
- Define the following terms: a. lipid bilayer b. fluid mosaic model c. membrane fluidity d. flippase e. floppasearrow_forwardWhich 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.arrow_forwardThe cells of plant seeds store oils in the form of droplets enclosed by membranes. Unlike the membranes you learned about in this chapter, the oil droplet membrane consists of a single layer of phospholipids rather than a bilayer. Draw a model for a membrane around an oil droplet. Explain why this arrangement is more stable than a bilayer.arrow_forward
- Consider the following diagram of the cell membrane. Which of the statements is NOT true regarding the cell membrane? Group of answer choices a. Proteins and carbohydrates are also components of the cell membrane. b. Certain phospholipids and proteins on the outer surface of the cell membrane are attached to carbohydrates. c. Some carbohydrates extend through the entire lipid bilayer and appear on both surfaces of the membrane d. Some of the proteins embedded in the cell membrane constitute channels (passage canals).arrow_forwardPositively charged molecules are often more easily endocytosed by cells than negatively charged molecules. Which of these BEST explains this observation? A. The hydrocarbon tails of membrane lipids are hydrophilic. B. The hydrocarbon tails of membrane lipids are hydrophobic. C. The phosphate group of membrane lipids are positively charged. D. The phosphate group of membrane lipids are negatively charged.arrow_forwardIn addition to phospholipids, eukaryotic membranes also contain sterols of various kinds. What's the role of these sterols a. Sterols increase membrane strength b. They function in attaching the membrane to outer layers c. They function in signaling d. They have no function that is critical for eukaryotic cellsarrow_forward
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