Question

unit 1.4 cell transport, homeostasis, feedback quiz 2025
which of the following is a correct difference between active transport and facilitated diffusion?
○ active transport requires energy from atp, and facilitated diffusion does not.
○ active transport involves transport proteins, and facilitated diffusion does not
○ facilitated diffusion involves transport proteins, and active transport does not
○ facilitated diffusion can move solutes against a concentration gradient, and active transport cannot.

Explanation:

To solve this, we analyze each option:

1. Option 1: Active transport requires ATP (energy) to move substances against the concentration gradient. Facilitated diffusion is a passive process (no energy, moves with gradient). This matches known concepts.
2. Option 2: Both active transport and facilitated diffusion use transport proteins. So this is incorrect.
3. Option 3: Both use transport proteins. Incorrect.
4. Option 4: Active transport moves against the gradient, facilitated diffusion moves with it. This is reversed. Incorrect.

Answer:

A. Active transport requires energy from ATP, and facilitated diffusion does not.