1.3 Active Transport

Question 1

define active transport

Answer 1

The net movement of particles from an area of low conc to an area of higher conc, against a conc gradient using ATP.

Question 2

how does active transport work?

Answer 2

• molecule/ion attaches to receptor site on carrier protein
• ATP binds to carrier protein then undergoes hydrolysis = P + ADP
• phosphate attaches to carrier protein ∴ causing it to chance shape
• it is released to the other side of the membrane

Question 3

what happens to P + ADP after the protein has changed shape

Answer 3

• phosphate leaves carrier protein ∴ it returns to its original shape
• ADP + P later reform during respiration

Question 4

name a respiratory inhibitor

Answer 4

cyanide