What does asymmetry of the membrane refer to? A. Differences in the arrangements and structures of the phospholipids in the bilayer. B. Differences in the arrangements, structures and kinds of proteins in the bilayer. C. Differences in the occurrence of carbohydrates in glycosylated proteins and lipids in the bilayer. D. Both A and B E. All of these.

What does asymmetry of the membrane refer to? A. Differences in the arrangements and structures of the phospholipids in the bilayer. B. Differences in the arrangements, structures and kinds of proteins in the bilayer. C. Differences in the occurrence of carbohydrates in glycosylated proteins and lipids in the bilayer. D. Both A and B E. All of these.

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter3: Cell Structure And Function

Section: Chapter Questions

Problem 11RQ: The tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a....

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a) 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.
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 these is not a function of the lipid bilayer? A. Changes the temperature B. Provides a flexible matrix C. Imposes a barrier to permeability
Explain the structure of cell membrane. If it is not bi-layer (only one layer of lipid) what may happened?
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.
The 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.
You make a phospholipid bilayer with short saturated hydro carbon tails. You measure the permeability of this membrane to oxygen and note it is very permeable. You then double the length of the hydro carbon tails, and remeasue membrane permeability. Would you predict that longer hydrocarbon tails increase of decrease permeability? Defend prediction
Which 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 function
I am confused as to why (d) or (e) are not correct. Is it not (d) because the inner surface of the vesicle becomes the extracellular component? And what about (e)? Is it because it's not between the organelles and the cytosol, but rather between the cytosol and the extracellular space?
The extracellular matrixa. assists in the movement of substances across the plasmamembrane.b. prevents the loss of water when cells are placed in a hypertonicsolution.c. has numerous functions that affect the shape and activities of thecell that produced it.d. contains the junctions that sometimes occur between cells.e. All of these are correct.
Biologists use the fluid mosaic model to descfibe membrane structure. Which statements about the fluid mosaic structure of a membrane are correct? Select the three correct statements. The framework of a membrane is a bilayer of phospholipids with their hydrophillic heads facing the aqeous environment inside and outside of the cell and their hydrophobic tails clustered in the center. The diverse proteins found in and attached to membranes perform many important functions. Because membranes are fluid, membrane protrins and phospholipids can drift about in the membrane. Membranes include a mosaic, or mix of carbohydrates embedded in a phospholipids bilayer. The kinky tails of some proteins help keep the membrane fluid by preventing the component molecules from packing solidly together.
What features of a membrane are major contributors to its selectivepermeability?a. phospholipid bilayerb. transport proteinsc. glycolipids on the outer surface of the membraned. peripheral membrane proteinse. both a and b