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Question 4 • EDG Biology A w/Lab

Which statement describes the phospholipid bilayer that makes up a cell membrane?

Answer

The hydrophobic heads point into and out of the cell, while the hydrophilic tails form a layer between the heads.

The hydrophobic tails point into and out of the cell, while the hydrophilic heads form a layer between the tails.

The hydrophilic heads point into and out of the cell, while the hydrophobic tails form a layer between the heads.

The hydrophilic tails point into and out of the cell, while the hydrophobic heads form a layer between the tails.

Explanation

Phospholipids have hydrophilic heads that are attracted to water and hydrophobic tails that avoid it. The heads face the watery environments inside and outside the cell, while the tails point inward toward one another, forming the middle of the bilayer. Therefore, choice C correctly describes the membrane.

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