Question

which of the following best describes the main difference between diffusion and active transport across a cell membrane? diffusion requires energy, active transport does not. active transport requires energy, diffusion does not. both require energy. neither require energy.

Explanation:

Diffusion is a passive process that does not require energy as substances move from high - to low - concentration areas. Active transport moves substances against the concentration gradient and requires energy (usually ATP).

Answer:

Diffusion requires energy - active transport does not (Incorrect). Active transport requires energy, diffusion does not (Correct). Both require energy (Incorrect). Neither require energy (Incorrect). So the correct statement is that active transport requires energy, diffusion does not.