Membrane Transport

Question 0

Transport Proteins

Answer 0

Carrier Proteins
-Interact closely with Solutes
-Make at least 2 shapes (in/out)
*Can be Passive or Active transport proteins
Channel Proteins
-Make a tunnel through the membrane
-Little interaction with the Solutes
-Less specific and Much Faster

Question 1

Membrane Solubility

Answer 1

The Stronger a molecule associates with water, the Harder it is to get through the bilayer
>Hydrophobic molecules - Diffuse Readily and Quickly
>Small Uncharged polar molecules - Cross Slowly
> Large “” - Only some cross, even slower
>Ions - will Not cross without Transport Membrane

Question 2

Passive Transport / Facilitated Diffusion

Answer 2

> Don’t require energy
Can happen through carrier or channel proteins
Driven by Concentration Gradient or Electrical Gradient

Question 3

Ionophores

Answer 3

• Passive Transport
• Makes holes in the membrane
• used as a defense mechanism

Question 4

Active Transport

Answer 4

• Use energy to Push Solutes through membrane Against concentration gradient
• Special Carrier proteins (pumps)

Question 5

Carrier Proteins - Active Transport

Answer 5

1. Couple Carrier: use co-transported ions to transport molecules
   >Symport: Same direction
   >Antiport: Opposite direction
2. ATP-Driven Pump: when ATP is the energy source to transport
3. Light-Driven Pump: when light is the energy source