In the fluid-mosaic model that describes plasma membranes,

Question

Quizplus · Accepted Answer

The fluid-mosaic model describes the plasma membrane as consisting of two layers of glycerophospholipid molecules with their hydrophilic heads facing the outside and inside of the cell, and their nonpolar tails oriented towards each other, creating a hydrophobic barrier between the inside and outside of the cell. This is known as a phospholipid bilayer. Other molecules, such as proteins, cholesterol, and carbohydrates, are also embedded in this bilayer, giving it a "mosaic" appearance. Choice A is incorrect because the nonpolar sections are oriented towards each other, not the outer surface of the membrane. Choice C is incorrect because the phospholipid bilayer consists of two layers, not one. Choice D is incorrect because there are only two layers of glycerophospholipid molecules. Choice E is incorrect because proteins are embedded within the phospholipid bilayer, not separating the contents of the cell from the surrounding fluids.

In the Fluid-Mosaic Model That Describes Plasma Membranes