Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Textbook Question
Chapter 5, Problem 2TY
Which of the following events can never be energetically favorable in a biological membrane and therefore will not occur spontaneously?
- a. the rotation of phospholipids
- b. the lateral movement of phospholipids
- c. the flip-flop of phospholipids to the opposite leaflet
- d. the rotation of membrane proteins
- e. the lateral movement of membrane proteins
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Phospholipids can move from one leaflet (layer) to the other in a cell membrane bilayer by
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increased diffusion
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flippases and floppases.
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Diffusion of membrane proteins was demonstrated by fusing human cells and mouse cells that had membrane proteins labeled with ________ of different colors.
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stained lipids
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radioactivity
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which of the following statements is correct about the movement of water across a plasma membrane
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c. even though it a polar molecule, it moves readily through the nonpolar lipid bilayer
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For biological membranes, which of the following statement is NOT true?
A. The phospholipid bilayer is a fluid matrix.
B. Protein can be anchored to the membrane by covalently linked lipid chains.
C. Proteins can move laterally across the membrane.
D. For organisms living in cold temperature, their cell membranes contain more triacylglycerols.
E. Transverse motion of lipid molecules can occur occasionally.
Enzyme lowers when...
A. The energy difference between the substrate and the transition state
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Chapter 5 Solutions
Biology
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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- Which of the following can most easily pass through the phospholipid bilayer of the cell plasma membrane without the involvement of proteins? A. small non-polar molecules B. small polar molecules C. large non-polar molecules D. large polar moleculesarrow_forwardTrue or False _____ a. the cell membrane is a selectively permeable or semi-permeable structure. _____b. Different proteins found in the membrane play specific roles in cell transport _____c. The lipid bilayer prevents polar molecules from easily passing through _____d. Water molecules cannot pass through the lipid bilayer of the cell membranearrow_forwardWhich of the following membrane transport proteins would you expect to be the most selective at conducting substances into the eukaryotic cell cytoplasm (although not the most rapid)? A. the bicarbonate ion channel B. the chloride ion channel C. the fructose carrier protein D. the sodium ion channel E. the potassium ion channelarrow_forward
- Which of the following does NOT contribute to the selective permeability of a biological membrane? a. Specificity of the carrier proteins in the membrane b. Selectivity of channel proteins in the membrane c. Hydrophobic barrier of the phospholipid bilayer d. Hydrogen bond formation between water and phosphate groupsarrow_forwardWhy can't ions like sodium (Na+) or potassium (K+) diffuse directly through the phospholipid bilayer? A. Ions can only use active transport to move through the membrane B. Ions are hydrophobic and are repelled by the polar membrane C. Ions are polar and are repelled by the nonpolar part of the membrane D. Ions need to become stable before entering the cellarrow_forwardExocytosis is the last step of secretion of proteins from the cell. There are two broad types of exocytosis. a) Name the two types of exocytosis b) Describe each type of exocytosis (i.e. how are they different from each other?) c) Give at least one example of each type of exocytosis.arrow_forward
- The plasma membrane is said to be a fluid-mosaic model because it contains a. waxes suspended within a mosaic of phospholipids.b. a mosaic of proteins suspended within a phospholipid bilayer.c. a polysaccharide mosaic suspended within a protein bilayer.d. a mosaic of phospholipids suspended within a protein bilayer.arrow_forwardAccording to the fluid-mosaic model of the plasma membrane, a.protein and phospholipids form a regular, repeating structure. b.the membrane is a rigid structure. c.phospholipids form a double layer, with the polar parts facing each other. d.proteins are free to move within a double layer of phospholipids.arrow_forwardA transmembrane protein in the plasma membrane is glycosylated attwo sites in the polypeptide sequence. Where in this protein would youexpect these two sites to be found?a. in transmembrane segmentsb. in hydrophilic regions that project into the extracellular environmentc. in hydrophilic regions that project into the cytosold. could be anywheree. b and c onlyarrow_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_forwardElectrical gradients ( potential; charges) exists on cell membranes because in part when the cell is at rest... a.The inner surface surface of the cell membrane is more negatively charged than the outer surface. b. the inner surface of the cell membrane is more positively charged than the outer surface. c. The membrane as a whole is hydrophilic on the outside. d. the membrane as a whole is hydrophobic on the outside e.None of the abovearrow_forwardIon channels are formed by a particular kind of membrane protein that allows the passage of a specific ion (or ions) under certain conditions. This type of protein is most likely a(n) a. peripheral membrane protein with additional hydrophobic domains b. integral membrane protein with a transmembrane domain c. a cholesterol-like molecule that is positioned in the phospholipid bilayer d. membrane phospholipid with hydrophilic head group e. soluble enzyme anchored to a scaffolding protein on the cytoplasmic side of the plasma membranearrow_forward
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