Membrane phospholipids
A) have hydrophobic heads that face the center of the membrane and are shielded from water.
B) have hydrophilic tails that face outward and are exposed to water.
C) are able to drift about in the plasma membrane.
D) remain fluid because they are tightly packed against one another.

Question

Quizplus · Accepted Answer

Membrane phospholipids are able to drift about in the plasma membrane, which contributes to the fluidity of the membrane. Choices A and B are incorrect because phospholipids have hydrophilic heads that face outward and are exposed to water, while their hydrophobic tails face inward and are shielded from water. Choice D is incorrect because phospholipids remain fluid because they are not tightly packed against one another, but rather have some space between them due to their fluidity.

Membrane Phospholipids