membrane transport

Question

Facilitated diffusion differs from active transport because it:

RankGuru · Accepted Answer

1. **Passive Transport**: Includes simple diffusion and **facilitated diffusion**. Molecules move **down their concentration gradient** (from high to low concentration).
2. **Facilitated vs Simple**: Simple diffusion happens through the bilayer; facilitated diffusion uses specific **carrier proteins** or channels because the molecule is polar/large.
3. **Active Transport**: Moves molecules **against the gradient** (from low to high concentration), which requires energy (**$ATP$**).
4. **Key Difference**: While both use protein carriers, facilitated diffusion **does not require energy input** and cannot move substances against a gradient.

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membrane transport

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