The part of a membrane protein that extends through the phospholipid bilayer is primarily composed of amino acids that are
A)highly polar.
B)negatively charged.
C)nonpolar.
D)positively charged.
E)water soluble.

Question

Quizplus · Accepted Answer

The hydrophobic interior of the phospholipid bilayer is composed of nonpolar tails, making it difficult for polar or charged molecules to pass through. Therefore, membrane proteins that span the bilayer are mostly composed of nonpolar amino acids that can interact with the hydrophobic environment.

The Part of a Membrane Protein That Extends Through the Phospholipid