Question

which term describes when a molecule moves from low to high concentration?
respiration
active transport
osmosis

Explanation:

To solve this, we analyze each option:

• Respiration: Involves gas exchange and energy production, not molecule movement against concentration gradient.
• Active transport: Requires energy (ATP) to move molecules from low to high concentration (against the gradient).
• Osmosis: Is the diffusion of water from high to low water concentration (down the gradient), not applicable here.

Answer:

B. Active transport