Biology

The correct answer is: B.

 

Here's why:

Protein channels and pumps are typically transmembrane proteins, meaning they span across the entire phospholipid bilayer. These proteins help transport molecules and ions across the cell membrane, either passively (through channels) or actively (using energy, as in pumps).

 

Let’s break down the other options:

A: Refers to the phospholipid bilayer structure, not proteins.

C: This could describe glycoproteins (proteins with carbohydrat...