A group of cells was treated with a proteolytic (protein-digesting) enzyme. Which of the following processes would be least affected by this treatment?

A) Diffusion of Na⁺ through membrane channels
B) Diffusion of lipid-soluble molecules through the plasma membrane
C) Use of carrier molecules in facilitated diffusion
D) Sodium-potassium exchange pump
E) Secondary active transport

Proteolytic Enzyme

An enzyme that breaks down proteins into smaller peptides or amino acids by hydrolysis of the peptide bonds.

Facilitated Diffusion

A process of passive transport, mediated by carrier proteins, allowing molecules to cross cell membranes along a concentration gradient.

Sodium-Potassium Exchange

A cellular process involving the active transport of sodium and potassium ions across the cell membrane, crucial for maintaining cellular and electrochemical functions.