Question

1. which process requires energy from the cell?

a. diffusion
b. osmosis
c. active transport
d. passive transport

Explanation:

• Diffusion is the movement of particles from high to low concentration, no energy needed.
• Osmosis is the diffusion of water, also passive (no energy).
• Passive transport (includes diffusion, osmosis) moves substances down concentration gradient, no energy.
• Active transport moves substances against concentration gradient, requiring cellular energy (ATP).

Answer:

C. Active transport