Option A. " It moves substances against a concentration gradient." is not a characteristic of facilitated diffusion as it moves along the concentration gradient.
Facilitated Diffusion is the movement of substances, molecules, or ions across a membrane from a higher concentration region to a lower concentration region with the help of a transport protein.
- Movement of solutes and ions along with the concentration gradient which s highly selective.
- The rate of facilitated diffusion is comparatively higher than normal
- It is highly specific to allow the movement of substances
- The rate of transport is saturable.
- it requires a carrier or transport molecule.
- requires no energy
- change in the shape of transport protein take place,
Thus, it is clear that substances move along the gradient rather than against the gradient during facilitated diffusion.
Learn more about facilitated diffusion:
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