BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 5, Problem 1U
The fluid mosaic model of the membrane describes the membrane as
a. containing a significant quantity of water in the interior.
b. composed of fluid phospholipids on the outside and protein on the inside.
c. composed of protein on the outside and fluid phospholipids on the inside.
d. made of proteins and lipids that can freely move.
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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.
Which of the following statements is true of membrane proteins?
a) They are suspended on the surface of the membrane.
b) They are partly embedded in the bilayer
c) They span across the bilayer and project from both sides
d) Any of these are true, depending on the specific membrane protein.
According 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.
Chapter 5 Solutions
BIOLOGY
Ch. 5.1 - Prob. 1LOCh. 5.1 - Explain the fluid mosaic model of membrane...Ch. 5.2 - List the different components of phospholipids.Ch. 5.2 - Prob. 2LOCh. 5.2 - Prob. 3LOCh. 5.3 - Illustrate the functions of membrane proteins.Ch. 5.3 - Prob. 2LOCh. 5.3 - Prob. 3LOCh. 5.4 - Compare simple diffusion and facilitated...Ch. 5.4 - Prob. 2LO
Ch. 5.4 - Prob. 3LOCh. 5.5 - Prob. 1LOCh. 5.5 - Prob. 2LOCh. 5.5 - Prob. 3LOCh. 5.6 - Distinguish between endocytosis and exocytosis.Ch. 5.6 - Illustrate how endocytosis can be specific.Ch. 5 - According to the fluid mosaic model, membranes are...Ch. 5 - Prob. 2IQCh. 5 - The fluid mosaic model of the membrane describes...Ch. 5 - What chemical property characterizes the interior...Ch. 5 - The transmembrane domain of an integral membrane...Ch. 5 - The specific function of a membrane within a cell...Ch. 5 - The movement of water across a membrane is...Ch. 5 - Prob. 6UCh. 5 - Which of the following is NOT a mechanism for...Ch. 5 - A bacterial cell that can alter the composition of...Ch. 5 - What variable(s) influence(s) whether a nonpolar...Ch. 5 - Which of the following does NOT contribute to the...Ch. 5 - How are active transport and coupled transport...Ch. 5 - A cell can use the process of facilitated...Ch. 5 - figure 5.5 describes a classic experiment...Ch. 5 - Each compartment of the endomembrane system of a...Ch. 5 - The distribution of lipids in the ER membrane is...
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- Which statements are consistent with the fluid-mosaic model of membranes? (a) All membrane proteins are bound to the interior of the membrane. (b) Both proteins and lipids undergo transverse (flip-flop) diffusion from the inside to the outside of the membrane. (c) Some proteins and lipids undergo lateral diffusion along the inner or outer surface of the membrane. (d) Carbohydrates are covalently bonded to the outside of the membrane. (e) The term mosaic refers to the arrangement of the lipids alone.arrow_forwarda) What are the forces that maintain structural integrity of biological membranes?b) Explain how each force mentioned is formed in membrane lipids. c) Comment on lipid to protein ratio in the membrane of molecules that transport insoluble substances in the blood.arrow_forwardWhich of the following factors would tend to increasemembrane fluidity?(A) a greater proportion of unsaturated phospholipids(B) a greater proportion of saturated phospholipids(C) a lower temperature(D) a relatively high protein content in the membranearrow_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_forwardWhich of the following statements about cellular membranes is/are FALSE? A. Only lipids move Within the membrane, while the proteins are anchored and immobile. B. Membranes are composed of lipids and proteins. C. Substances may be transported across membranes by active transport, facilitated transport or diffusion. D. Membrane proteins are classified as integral or peripheral, upon their functionarrow_forwardWhat variable(s) influence(s) whether a nonpolar molecule can move across a membrane by passive diffusion? a. The structure of the phospholipids bilayer b. The difference in concentration of the molecule across the membrane c. The presence of transport proteins in the membrane d. All of the choices are correct.arrow_forward
- which of the following statements is correct about the movement of water across a plasma membrane a. it cannot pass through any ion channels b. it moves through the membrane via mediated transport c. even though it a polar molecule, it moves readily through the nonpolar lipid bilayer d. artificial lipid membranes are impermeable to waterarrow_forwardThe plasma membrane isa. a carbohydrate layer that surrounds groups of cells to protect them.b. a double lipid layer with proteins inserted in it, which surrounds every cell individually.c. a thin sheet of structural proteins that encloses cytoplasm.d. composed of proteins that form a protective barrier.arrow_forwardYou find a membrane protein that moves molecules across a membrane. What type of transport could that protein be involved in?arrow_forward
- Which of the following is incorrect regarding facilitated diffusion?a. It is a passive process.b. It allows the movement of molecules from areas of lowconcentration to areas of high concentration.c. It may use either channel or carrier proteins.d. It allows the rapid transport of glucose across the membrane.arrow_forwardWhich of the following is/are true about the Cellular Membrane Structure: A. All membranes from plants, animals and microorganisms have similar biomolecular ultrastructure but varies in the types of lipids found. B. All membranes examined that have 2 dark-staining layers in the electron microscope indicated the presence of a layer exposed to the outer cell surface and another facing the cytiplasmic layer. C. The plasma membrane of cells are seen as thin, rigid, gel-like structure that is around 5-10nm thick. D. Some membranes have more protein components and some have similar percentage composition as the lipids. A, B, C only B, C, D only A, C, D only A, B, D onlyarrow_forwardHow can substances be transported across a membrane against their concentration gradient? A. If the plasma membrane is fully hydrophobic. B. The plasma membrane is permeable to all small molecules. C. Some membrane proteins act as channels for specific molecules to enter the cell. D. Some membrane proteins are ATP-dependent carrier molecules.arrow_forward
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