Question

multiple choice question
the transport mechanism that requires atp input is called ______.

○ osmosis
○ active transport
○ passive transport
○ diffusion

Explanation:

• Osmosis is the movement of water across a semipermeable membrane, no ATP needed.
• Active transport moves substances against their concentration gradient, requiring ATP (energy) input.
• Passive transport (including diffusion) moves substances down the concentration gradient, no ATP needed.
• Diffusion is the movement of particles from high to low concentration, no ATP needed.

Answer:

B. active transport