Facilitated Diffusion

Question 1

In facilitated diffusion this cannot pass through the cell membrane

Answer 1

-glucose

Question 2

Why can’t glucose pass through the cell membrane?

Answer 2

-they are insoluble in the phospholipid bilayer

Question 3

What is facilitated diffusion?

Answer 3

-form of diffusion that allows movement of these molecules across a membrane, down a conc gradient

Question 4

Is facilitated diffusion active or passive?

Answer 4

-passive

Question 5

Two types of transport proteins

Answer 5

-Channel proteins
-Carrier proteins

Question 6

Channel proteins are

Answer 6

-molecules with pores, lined with polar groups

Question 7

Are channel proteins hydrophobic or hydrophilic

Answer 7

hydrophilic

Question 8

What can pass through the channel proteins?

Answer 8

-water soluble ions

Question 9

The channels open and close…

Answer 9

according to the needs of the cell

Question 10

Carrier proteins allow

Answer 10

diffusion of larger polar molecules such as sugars and amino acids across the membrane

Question 11

The carrier protein changes shape and

Answer 11

releases the molecule on the other side of the membrane before changing back to its original shape

Question 12

Channel proteins

Answer 12

channel proteins
-pores
-allow diffusion and f-diffusion
-solute does not bind to transport proteins
-do not change shape
-only transport water-soluble molecules
-transports 10^8 ions per second

Question 13

Carrier proteins