Question

question 13
how is active transport different from passive transport?
active transport moves substances down the concentration gradient, while passive transport moves them against it.
active transport requires energy, while passive transport does not.
active transport uses protein channels, while passive transport does not.
active transport only moves water, while passive transport moves other molecules.

Explanation:

• Active transport: Moves substances against concentration gradient, requires energy (e.g., ATP).
• Passive transport: Moves substances down concentration gradient, no energy input needed (e.g., diffusion, osmosis).
• Protein channels: Used in both (e.g., facilitated diffusion - passive; some active transport).
• Water movement: Osmosis (passive), active transport moves various molecules (not just water).

Answer:

active transport requires energy, while passive transport does not.