Which of the following is a correct description of the intracellular side of the plasma membrane relevant to nutrient transport?

• A. It is impermeable to water and small gases, preventing their diffusion under normal physiological conditions.
• B. It consists mainly of cellulose fibers that create pores specific only to lipid-soluble vitamins.
• C. It is hydrophilic throughout and therefore allows all polar solutes to diffuse freely without channels.
• D. It faces the cytosol and has a hydrophobic core formed by fatty acid tails of phospholipids that resists passage of polar molecules.

Answer: (D)