4.4 active transport

Question 1

active transport definition

Answer 1

the movement of molecules or ions or out of a cell from a region of lower concentration to a region of higher concentration using ATP and carrier proteins

Question 2

describe the process of direct active transport (4)

Answer 2

• molecule or ion binds to receptor sites on the carrier protein
• ATP binds to the protein causing ATP hydrolysis and protein changes shape
• molecule or ion is released to other side of the membrane
• pi released from protein which causes shape to change back to its original shape

Question 3

what is co-transport?

Answer 3

ATP used to individually move molecules using a concentration gradient which has already been set up by direct active transport