Question

(c) describe the characteristics of the phospholipid bilayer that permit small hydrophobic lipid molecules to pass directly across the membrane.

Explanation:

The phospholipid bilayer has a non - polar interior. Hydrophobic lipid molecules are non - polar and can dissolve in the non - polar region of the bilayer. The bilayer is fluid, allowing for movement of lipids and small non - polar molecules to diffuse across.

Answer:

The phospholipid bilayer has a non - polar interior due to the fatty acid tails of the phospholipids, which creates a hydrophobic environment. Small hydrophobic lipid molecules are non - polar and can dissolve in this non - polar region, allowing them to pass directly across the membrane. Additionally, the fluid nature of the bilayer enables the movement of these molecules through the membrane structure.