question archive requires ATP is Water An active transport occurs against the concentration gradient
requires ATP is Water An active transport occurs against the concentration gradient
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requires ATP is Water
An active transport occurs against the concentration gradient. The tendency of a substance is to diffuse from the most concentrated compartment to the least. This is why passive transport does not require ATP - it occurs spontaneously. When a substance must be transported against its concentration gradient, it requires energy to activate (active transport). Osmosis is a type of diffusion, being a passive transport. Osmosis specifically refers to water molecules diffusion.
