AP Bio 2.7

Question 1

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Facillitated diffusion requires…

Answer 1

membrane protiens

Question 2

What is facillitated diffusion?

Answer 2

The movement of molecules from a high concentration to a low concentration through protiens

Question 3

What can be moved in facillitated diffusion?

Answer 3

1. Big or small polar molecules
2. Large quantities of water
3. Charged ions such as Na+ (sodium) and K+ (pottasium)

Question 4

Large quantities of water can pass though…

Answer 4

aquaporins

Question 5

Charged ions such as Na+ and K+ require…

Answer 5

channel protiens

Question 6

Active transport requires…

Answer 6

1. Carrier protiens called pumps
2. The use of metabollic energy (ATP)

Question 7

What does active transport do?

Answer 7

It moves molecules against their concentration gradient (from low to high concentration) by the use of carrier protiens

Question 8

What is cotransport?

Answer 8

It is a secondary form of active transport that uses electrochemical energy to establish a concentration gradient to transport two different ions across the membrane through a protien

Question 9

What are the two types of cotransport?

Answer 9

Symport: when two different ions flow in the same direction
Antiport: when two different ions flow in opposite directions

Question 10

What is there a possibility of happening with membranes that utilize the movement of ions?

Answer 10

It may become polarized

Question 11

What’s an electrochemical gradient?

Answer 11

It’s a type of concentration gradient

(Membrane potential - voltage across a membrane)