In the cell membrane,the hydrophilic part of the phospholipid molecule:
A) faces the exterior of the cell.
B) faces the interior of the cell.
C) is in the center of the phospholipid bilayer.
D) is both A and B.

Question

Quizplus · Accepted Answer

The hydrophilic part of the phospholipid molecule faces both the exterior and interior of the cell, while the hydrophobic part faces the interior of the membrane. This is because the hydrophilic head is polar and can interact with water molecules, while the hydrophobic tails are nonpolar and repel water. Therefore, the phospholipids arrange themselves in a bilayer with the hydrophilic heads facing outwards towards the water and the hydrophobic tails facing each other in the interior of the membrane.

In the Cell Membrane,the Hydrophilic Part of the Phospholipid Molecule