Question

multiple choice question
a cell membrane functions due to the ________. this layer creates a barrier through which water - soluble substances cannot move through easily. this means that the plasma membrane can separate the environment inside the cell from the environment outside the cell.

• protein bilayer
• permeability bilayer
• phospholipid bilayer

Explanation:

The cell membrane's structure that creates a barrier for water - soluble substances is the phospholipid bilayer. The phospholipid bilayer has a hydrophobic interior and hydrophilic exterior, which restricts the easy passage of water - soluble substances. A protein bilayer is not the main structural component for this barrier function, and there is no such thing as a "permeability bilayer" in the context of cell membrane structure.

Answer:

C. phospholipid bilayer