Phospholipid bilayer membranes are selectively permeable.What does that mean?

Question

Quizplus · Accepted Answer

A selectively permeable membrane means that certain molecules or ions are allowed to cross the membrane while others are restricted. In the case of a phospholipid bilayer membrane, it allows nonpolar molecules (such as oxygen, carbon dioxide, and fatty acids) to pass through easily, while polar or charged molecules (such as ions and larger molecules like glucose) are restricted or require specific transport proteins for entry or exit. So, the correct answer is D, which states that phospholipid bilayer membranes allow some things to cross while restricting others.

Phospholipid Bilayer Membranes Are Selectively Permeable