4.2 - Diffusion

Question 1

What is the definition of diffusion?

Answer 1

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

Question 2

Is facilitated diffusion passive or not

Answer 2

Passive

Question 3

Does facilitated diffusion require ATP?

Answer 3

No

Question 4

What are the two types of protein involved in facilitated diffusion?

Answer 4

• protein channels
• carrier proteins

Question 5

What do protein channels allow through

Answer 5

Specific water soluble ions

Question 6

How do protein channels work?

Answer 6

The ions bind with the protein causing it to change shape in a way that closes it to one side of the membrane and opens it to the other side

Question 7

How do carrier proteins work?

Answer 7

When a molecule such as glucose that is specific to the protein is present it binds with the protein this causes it to change shape in such a way that the molecule is releases to the inside of the membrane.