Question

Proteins are needed for
1. Facilitated diffusion
2. Passive transport
3. both of them
4. None of the above

Answer 1

Proteins are considered as essential elements not only for body building purpose but also for facilitating diffusion.

Proteins help to transport water and certain ions.

They form protein-lined channels in the membrane and helps to pass through it water and soluble ions at a very fast rate.

However, there are certain channels that enable only selective diffusion or no transportation at all, unless some signals are present.