Chapter 3 Lecture 5 - Membrane Transport

Question 1

Compartmentation

Answer 1

Separation allows specialization

Question 2

Functional Classes of Membrane Proteins (6)

Answer 2

• Receptor
• Enzyme
• Channel
• Cell identity marker
• Cell Adhesion Molecule
• Carrier

Question 3

How does carrier mediated transport work

Answer 3

Molecule binds from one side, shape changes to close the side from which the molecule entered, other side is opened, solute is released

Question 4

Saturation (in terms of carrier mediated transport)

Answer 4

max number of molecules bound to carriers, no matter how many are waiting, rate remains the same

Question 5

Uniport transporters

Answer 5

Simplest, transport 1 type in 1 direction

Question 6

Coupled transporters

Answer 6

2 solutes

Question 7

Symport

Answer 7

Type of coupled transporter, 2 solutes in the same direction

Question 8

Antiport

Answer 8

2 solutes in opposite directions

Question 9

Facilitated diffusion

Answer 9

Passive transport, solute moves down concentration gradient

Question 10

Steps to facilitated diffusion

Answer 10

1. Solute binds to 1 side
2. Conformation changes
3. Solute released on other side

Question 11

Primary Active Transport

Answer 11

ATP-powered carrier mediated transport, solute moves up concentration gradient

Question 12

What does primary active transport contribute to (in terms of equilibrium)

Answer 12

Disequilibrium

Question 13

Example of primary active transport

Answer 13

Sodium potassium pump

Question 14

Secondary Active Transport

Answer 14

Requires ATP indirectly, coupled transporters used

Question 15

Steps to secondary active transport

Answer 15

1. one molecule moves down concentration gradient

2. Step 1 powers second molecule to move up concentration gradient

Question 16

Example of Secondary active transport

Answer 16

Sodium-Glucose Transport Proteins