Active Transport:

Question 1

What is active transport?

Answer 1

= carrier proteins in the membrane transport a chemical from a region of lower concentration to a region of higher concentration agaisnt a concentration gradient
= requires metabolic energy provided by ATP

Question 2

How does active transport work?

Answer 2

= the molecule or ion to be transported attaches to the receptor site on the carrier protein
= ATP binds to the carrier protein undergoes hydrolosis producing phosphate and a molecule of ADP
= phosphate attaches to the carrier protein and causes it to change shape
= released at the other side

Question 3

What happens to the phosphate molecule?

Answer 3

= leaves the carrier protein returns to previous shape
= ADP + phosphate will reform into ATP during respiration

Question 4

Does active transport use a lot of ATP?

Answer 4

= yes

Question 5

Are carrier proteins specific?

Answer 5

= yes
= transport one type of ion and molecule