Active Transport

Question 1

What is it?

Answer 1

Movement of molecules or ions into or out of a cell from a region of low concentration to a region of high concentration using ATP and carrier proteins

Question 2

What is ATP used for in AT

Answer 2

Directly move molecules via the concentration gradient

Question 3

How does it differ from passive forms of transport 4

Answer 3

ATP needed
Substances moved against conc G low to high
Carrier protein mols “pumps”
Process is selective

Question 4

Direct active transport step 1

Answer 4

Carrier proteins span plasma membrane and bind to mol/ ion

Question 5

Direct active transport step 2

Answer 5

Mol or ion binds to receptor sites on carrier protein

Question 6

Direct active transport step 3

Answer 6

On the inside of cell/ organelle. ATP binds to protein causing the split of ADP + Pi therefore protein mol changes shape and opens opposite side of membrane

Question 7

Direct active transport step 4

Answer 7

Mol/ ion released on the other side of membrane

Question 8

Direct active transport step 5

Answer 8

Phosphate mol released. Protein back to normal shape ready for repeat of process. Pi mol the recombined worn ADP to form ATP in respiration

Question 9

Sodium potassium pump

Answer 9

When an ion is moving in the same time as one is moving out

Question 10

3 bullet points

Answer 10

Carrier proteins
ATP
Against a concentration gradient