What is true of the proteins illustrated in the diagram below? Select all statements that are true. Protein molecules Protein channel(C) cell membrane O a. Protein B has two hydrophilic parts and one hydrophobic part O b. Protein A is temporarily associated with the plasma membrane O c. Proteins A and B are integral membrane proteins O d. Protein B uses secondary active transport O e. Proteins A and B are steroids

What is true of the proteins illustrated in the diagram below? Select all statements that are true. Protein molecules Protein channel(C) cell membrane O a. Protein B has two hydrophilic parts and one hydrophobic part O b. Protein A is temporarily associated with the plasma membrane O c. Proteins A and B are integral membrane proteins O d. Protein B uses secondary active transport O e. Proteins A and B are steroids

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter3: The Plasma Membrane And Membrane Potential

Section: Chapter Questions

Problem 1TAHL: Which of the following methods of transport is being used to transfer the substance into the cell in...

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Which of the following methods of transport is being used to transfer the substance into the cell in the accompanying graph? a. diffusion down a concentration gradient b. osmosis c. facilitated diffusion d. active transport e. vesicular transport f. It is impossible to tell with the information provided.
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.
A 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 only
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.
According to the fluid mosaic model of membrane structure,proteins of the membrane are mostly(A) spread in a continuous layer over the inner and outersurfaces of the membrane.(B) confined to the hydrophobic interior of the membrane.(C) embedded in a lipid bilayer.(D) randomly oriented in the membrane, with no fixed insideoutside polarity.
What 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.
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.
a. integral memebrane protein that crosses membrane multiple time b. lipid-linked membrane proteins c. peripheral memebrane protein d. integral memebrane protein that crosses membrane ince
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
Among the membrane transporters, the channels require energy and therefore are involved in active transport. * D. Disagree, because channels are not proteins and therefore are not involved in active tranport. A. Agree, because channels are associated with H+-ATPase. B. Disagree, because the pumps are the ones involved in active transport. C. Agree, because channels are proteins involved in active transport.
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Active transport pumps are used to move sodium ions across the membranes of gill cells in freshwater fish species. Which of the following statements about the pumps is accurate?Explain. a) There are specific binding sites for sodium ions on the pump b) They require osmosis to carry the sodium ions into the cell c) This is an example of passive diffusion and ATP is required d) Their lipid based structure allows it to embed in the cell membrane