Facilitated Diffusion

Question 1

What is facilitated diffusion?

Answer 1

It’s a passive transport process that uses proteins to help molecules move across a cell membrane.

Question 2

How does carrier proteins move large molecules into or out of the cell, down their concentration gradient?

Answer 2

1. First, a large molecule attaches to a carrier protein in the membrane.
2. Then, the protein changes shape.
3. This releases the molecule on the opposite side of the membrane.

Question 3

True or False: Different carrier proteins facilitate the diffusion of different molecules.

Answer 3

True

Question 4

Fill in the blank: Channel proteins form pores in the membrane for ______ ______ to diffuse through (down their concentration gradient).

Answer 4

Charged particles

Question 5

True or False: All channel proteins facilitate the diffusion of all charged particles.

Answer 5

False because:
Different channel proteins facilitate the diffusion of different charged particles.