13. A peripheral membrane protein is best described as a protein a. embedded within the phospholipid bilayer. b. that is transmembrane in nature. c. loosely attached to the inner membrane leaflet. d. that traverses the cytosol of a living cell. 14.Sphingomyelin is identified in plasma membrane of a healthy living cell. Which of the following describes its location in that membrane? a. The outer membrane leaflet. b. In a transmembrane arrangement. c. Intercalated between phospholipids. d. Anchored to lipids facing the cytosol. 15.Protein Y is covalently linked to a fatty acid chain of phospholipid of the inner leaflet of a cell's plasma membrane, but its structure does not extend to the hydrophobic core of the phospholipid layer. Therefore protein Y a. Has glycosylated region facing the cytosol. b. functions as a ligand receptor. c. is a single transmembrane protein. d.is oriented towards the cytosolic compartment.

13. A peripheral membrane protein is best described as a protein a. embedded within the phospholipid bilayer. b. that is transmembrane in nature. c. loosely attached to the inner membrane leaflet. d. that traverses the cytosol of a living cell. 14.Sphingomyelin is identified in plasma membrane of a healthy living cell. Which of the following describes its location in that membrane? a. The outer membrane leaflet. b. In a transmembrane arrangement. c. Intercalated between phospholipids. d. Anchored to lipids facing the cytosol. 15.Protein Y is covalently linked to a fatty acid chain of phospholipid of the inner leaflet of a cell's plasma membrane, but its structure does not extend to the hydrophobic core of the phospholipid layer. Therefore protein Y a. Has glycosylated region facing the cytosol. b. functions as a ligand receptor. c. is a single transmembrane protein. d.is oriented towards the cytosolic compartment.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter5: Structure And Function Of Plasma Membranes

Section: Chapter Questions

Problem 7RQ: A scientist compares the plasma membrane composition of an animal from the Mediterranean coast with...

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17. The transition temperature of a membrane bilayer is determined directly or indirectly a. the ability of lipid molecules to be packed together b. whether the fatty acid chains of the lipids are saturated or unsaturated c. the extent to which the fatty acid chains of the lipids contain double bonds d. the length of the fatty acid chains. e. All of the above are correct answers.
1. Explain in detail how amino acids can be transported across the plasma membrane 2. By using the concept of endomembrane system, explain how plasma membrane involves in the protein synthesis of a cell. 3. With suitable examples, compare the structural and functional differences between a fibrous and globular protein. 4. A person suffers from a skin condition and loss of muscle. A doctor suspects the patient has protein deficiency. Justify why the doctor thinks so.
3. The protein integrin binds to actin filaments and, by binding to proteins like fibronectins, connects to collagen. In this manner, integrin ______. A.controls the permeability of the cytoplasmic membrane B. suspends organelles within the cytoplasm C. provides a direct linkage between the cytoskeleton and the extracellular matrix D. helps keep individual cells in place and connects adjacent cells to each other
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
4. The cells making up the epithelial linings of organs that contain liquid, e.g., the bladder and intestines, could be expected to be held together via many ______ in order to provide a waterproof lining. A. tight junctions B. gap junctions C. phospholipids D. intermediate filaments
6. A researcher isolates and collects a particular cell membrane protein and injects a pure solution of these proteins into a laboratory animal. The laboratory animal most likely ______. A. incorporates the proteins into its own cell membranes B. digests the proteins as a food source C. produces antibodies that bind specifically to that membrane protein D. goes into shock and die
1. Imagine a hypothetical situation in which an animal cell such as a hepatocyte or a macrophage would completely lose the ability to produce membrane proteins. a) What would be the structural and molecular organization of such a hypothetical cell? b) How do you think this situation would affect the function of that cell? Be as thorough as you can.
1. When considering tight junctions, adherens junctions, and desmosomes: a. Which ones do not help in resisting mechanical stress and holding cell shape? Why not? b. Considering how the mechanical junctions are placed in the plasma membrane, why don’t they provide a truly sealed barrier?
Which of the following statements about proteins is correct? a. Proteins are transported to the rough ER for use within the cell. b. Lipids and carbohydrates are added to proteins by the Golgi complex. c. Proteins are transported directly into the cytosol for secretion from the cell. d. Proteins that are to be stored by the cell are moved to the rough ER. e. Proteins are synthesized in vesicles.
A scientist compares the plasma membrane composition of an animal from the Mediterranean coast with one from the Mojave Desert. Which hypothesis is most likely to be correct? The cells from the Mediterranean coast animal will have more fluid plasma membranes The cells from the Mojave Desert animal will have a higher cholesterol concentration in the plasma membranes The cells’ plasma membranes will be indistinguishable The cells from the Mediterranean coast animal will have a higher glycoprotein content, while the cells from the Mojave Desert animal will have a higher lipoprotein content.
A driving ion moving through a membrane channel in one direction gives energy to actively transport another molecule in the opposite direction. What is this process called? a. facilitated diffusion b. antiport transport c. symport transport d. primary active transport pump e. contransport
The tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a. phosphate groups; hydrophobic b. fatty acid groups; hydrophilic c. phosphate groups; hydrophilic d. fatty acid groups; hydrophobic