BIOLOGY
12th Edition
ISBN: 9781264839698
Author: Raven
Publisher: MCG CUSTOM
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Textbook Question
Chapter 5, Problem 3U
The transmembrane domain of an integral membrane protein
a. is composed of hydrophobic amino acids.
b. often forms an α-helical structure.
c. can cross the membrane multiple times.
d. All of the choices are correct.
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Students have asked these similar questions
Which of the following best describes an integral membrane protein?
A.A protein that has an extracellular domain, a membrane-spanning domain that spans the lipid bilayer of the plasma membrane, and an intracellular domain.
B.A protein that peripherally associates with the membrane via ionic interactions another protein embedded in the membrane.
C.A protein that is soluble in the cytoplasm.
D.A protein that peripherally associates with the membrane via ionic interactions between polar charged amino acids and the polar head groups of the phospholipids in the membrane.
Describe the properties of the three classes of membrane proteins (integral, peripheral, and lipid-anchored) along:
A. differences from each other
B. variation among themselves
Ion 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 membrane
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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- 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.arrow_forwardWhich of the following describes the fluid mosaic model of the plasma membrane structure? a. The lipid bilayer is solid at body temperature, thus protecting the cell. b. The phospholipid bilayer is embedded with associated proteins, cholesterol and sugars and has a dynamic arrangement. c. The plasma membrane is composed of two layers of proteins embedded with lipids. d. Phospholipids consist of a polar head and a nonpolar tail made of three fatty acid chainsarrow_forwardWhat is the primary characteristic of peripheral membrane proteins? A: They cannot be post-translationally modified. B: They span the entire lipid bilayer, sometimes multiple times. C: Detergents or nonpolar solvents are necessary to remove them from the lipid bilayer. D:Weak intermolecular forces keep them attached to the lipid membrane.arrow_forward
- Membrane proteins perform the following functions EXCEPT one. Which One? A. form the glycocalyx B. act as receptor proteins C. form pores to allow the passage of small solutes D. behave as enzymes.arrow_forwardWhich of the following is NOT a function of membrane proteins? a.Regulate the passage of ions b.Act as carrier molecules for various solutes c.Act as anchors or stabilizers for the cell membrane d.Storage of cellular nutrientsarrow_forwardWhich of the following statements regarding the selective permeability of the lipid bilayer is FALSE? A. the permeability of the lipid bilayer to different substances varies. B. The lipid bilayer component of the plasma membrane is highly permeable to nonvolatile molecules such as oxygen. C. The more hydrophobic or lipid soluble a substance is, the greater the lipid bilayers permeability to that substance. D. The lipid bilayer component of the plasma membrane is moderately permeable to ions and large, uncharged polar moleculesarrow_forward
- Mark the following statements about the plasma membrane as true or false. If a statement is false, correct it to make a true statement. a. _____ Integral membrane proteins generally span the width of the plasma membrane, whereas peripheral proteins are found on only one side of the membrane. b. _____ Cholesterol provides the plasma membrane with stability in the face of changing ion concentrations . c. _____ Membrane cholesterol is vitally important for cell-cell recognition. d. _____ Membrane proteins often function as channels or carriers. e. _____ The overall structure of the plasma membrane is a mosaic with the components locked tightly in placearrow_forwardProteins of the plasma membrane carry out all of the following functions except Select one: a. anchoring the cell to external structures. b. transporting substances across the membrane. C. sending and receiving signals to and from other cells. d. binding to DNA to turn on genes. e. catalyzing chemical reactions at the inner or outer surface of the membrane.arrow_forwardTransmembrane proteins span the width of the cell membranes. Four types of transmembrane proteins are shown in a section of cell membrane. Although these proteins have different specific functions, they all -- a. help the cell interact with its external environment b. stop chemical reactions within the cell c. synthesize molecules that signal other cells d. remove large waste particles from the cytoplasm of the cell.arrow_forward
- Protein X is an unknown membrane protein found in erythrocytes that cannot be extracted from plasma membranes using a concentrated salt solution but can be extracted by detergents. What type of membrane protein is protein X? O A. Protein X is an integral membrane protein. O B. Protein X is an amphitrophic membrane protein. OC. Protein X could be a peripheral membrane protein or an integral membrane protein. D. Protein X is a peripheral membrane protein. O E. Protein X could be a peripheral membrane protein or an amphitrophic membrane protein.arrow_forwardwhich one of the following diffuses more readily through the lipid bilayer of a plasma membrane a. polar molecules b. non polar molecules c. ionized molecules d. waterarrow_forwardIn the plasma membrane, form(s) the lipid bilayer,determine(s) the fluid nature of the membrane, andmainly determine(s) the function of the membrane.a. phospholipids, cholesterol, proteinsb. phospholipids, proteins, cholesterolc. proteins, cholesterol, phospholipidsd. cholesterol, phospholipids, proteinse. cholesterol, proteins, phospholipidsarrow_forward
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