Question

active transport and facilitated diffusion are similar because they both ______.
use proteins to move materials across a membrane
transport solutes using energy provided by atp
are independent of solute concentration
use diffusion to move materials across a membrane

Explanation:

• Option 1: Active transport uses carrier proteins (like pumps) and facilitated diffusion uses channel or carrier proteins to move substances across the cell membrane. So this is a similarity.
• Option 2: Facilitated diffusion is passive and does not use ATP energy, while active transport does. So this is incorrect.
• Option 3: Both processes are influenced by solute concentration (e.g., facilitated diffusion depends on concentration gradient, active transport may work against it but still relates to concentration in some cases). So this is incorrect.
• Option 4: Facilitated diffusion is a type of diffusion (passive, down concentration gradient), but active transport is not diffusion (it's active, often against gradient). So this is incorrect.

Answer:

A. use proteins to move materials across a membrane