unit 2,Active Transport

Question 1

What is active transport?

Answer 1

Net movement of molecules from an area of low concentration to an area of high concentration, which requires energy

Question 2

What’s an example of a cell that uses active transport?

Answer 2

Root hair cells

Question 3

What adaptations do root hair cells have for active transport?

Answer 3

• has a membrane that has carrier molecules that carry minerals in active transport
  -large surface area
• lots of mitochondria , for the ATP required in active transport
• it has a proton pump

Question 4

What are carrier proteins?

Answer 4

They attach to molecules, they then change the shape of them

Question 5

What does the proton pump do in root hair cells?

Answer 5

• uses active transport to remove the hydrogen ion from the root hair cell into the soil
  -the protons displace the metal minerals so they gain these ( mg2+ and k+) from the soil
• metal ions diffuse in via carriers (facilitated diffusion)

Question 6

What is co-transport?

Answer 6

The concentration of one molecule is used to move the other molecule , by the electrochemical gradient because it energises the other molecule

Question 7

What does the sodium potassium pump, pump simultaneously?

Answer 7

3 sodium, 2 potassium