4.2 Diffusion

Question 1

Diffusion:

Answer 1

-The net movement of molecules/ions
-from a region where they are more highly concentrated to one where their concentration is lower
-until they are evenly distributed

Question 2

What is the movement of the molecules like in simple diffusion?

Answer 2

-particles are constantly in motion due to KE
-motion is random, no set pattern
-constantly bouncing off one another as well as off objects

Question 3

What type of proteins are involved in facilitated diffusion?

Answer 3

• channel proteins
• carrier proteins

Question 4

facilitated diffusion (carrier proteins)

Answer 4

• carrier proteins are specific to the molecule
• the molecule binds to the receptor and causes a confirmational change which moves the molecule through
• once the molecule is passed through the carrier protein reverts to its original shape