Cell membranes are asymmetrical. Which of the following may be a most likely explanation? the cell membrane forms a border between one cell and another in tightly packed tissues such as epithelium cell membranes communicate signals from one organism to another the two sides of a cell membrane face different environments and can carry out different functions the "innerness" and "outerness" of membrane surfaces are predetermined by special genes proteins can only be associated with the cell membranes on the cytoplasmic side QUESTION 18 According to the fluid mosaic model of cell membranes, which of the following is a true statement about membrane phospholipids? they can move laterally along the plane of the membrane they frequently flip-flop from one side of the membrane to the other they occur only on the cytoplasmic side of a they are free to depart from the membrane and dissolve in the surrounding solution they have hydrophilic tails in the interior of the membrane
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This is due to the fact that the cell membrane forms a border between one cell and another in tightly packed tissues such as epithelium. Show more…
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Which of the following statements best describes a characteristic of biological membranes? A/ Phospholipids move laterally within the plane of the membrane. B/ Phospholipids are arranged with hydrophilic tails in the interior of the membrane. C/ Phospholipids generally occur in an uninterrupted bilayer, with membrane proteins restricted to the surface of the membrane. D/ Phospholipids never flip-flop from one layer of the membrane to the other. Which of the following statements best describes the structure of a membrane based on the fluid mosaic model? A/ The membrane is composed of a single layer of fluid phospholipids between two layers of hydrophilic proteins. B/ The membrane is composed of a fluid bilayer of phospholipids with embedded amphipathic proteins. C/ The membrane is composed of a fluid bilayer of phospholipids between two layers of hydrophilic proteins. D/ The membrane is composed of a mosaic of fluid polysaccharides and amphipathic proteins.
Josee P.
Which of the following is true regarding the cell membrane? Only eukaryotic cells have a cell membrane. Vesicles from the endomembrane system never fuse with the cell membrane. Phospholipids often move from the external half to the internal half of the membrane. Cell membrane proteins tend to have the nonpolar R groups of the amino acids associated with the inner part of the membrane. Fatty acid tails of the membrane face the cytosol and the extracellular space.
Dr. Anas S.
All new phospholipids are added to the cytosolic leaflet of the ER membrane, yet the ER membrane has a symmetrical distribution of different phospholipids in its two leaflets. By contrast, the plasma membrane, which receives all its membrane components ultimately from the ER, has a very asymmetrical distribution of phospholipids in the two leaflets of its lipid bilayer. How is the symmetry generated in the ER membrane, and how is the asymmetry generated and maintained in the plasma membrane?
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