Active transport

Question 1

what is active transport?

Answer 1

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

Question 2

ATP is used in active transport to?

Answer 2

Directly move molecules
Individually move molecules using a concentration gradient set up by direct transport

Question 3

Differences between active and passive transport.

Answer 3

+ATP is need for active transport
+Substances move against the concentration gradient on active transport.
+Carrier proteins act as ‘pumps’ in active transport.
+The process is very selective, so only some molecules get transported in active transport

Question 4

Process of active transport

Answer 4

1.Carrier protein bind to ion or molecule
2.The ions or molecules bind to the receptor sites of the proteins
3.Inside the cell ATP binds with the protein and releases a ADP and a phosphate molecule. As a result, the protein changes shape and opens to the opposite side.
4.The molecule or ion is release to the other side.
5.The protein releases the phosphate molecule and causes the protein to revert back to it’s original shape. Then, the phosphate molecule bonds with ADP to form ATP in respiration.

Question 5

Sodium-Potassium pump

Answer 5

Sometimes, more than one molecule gets transported.
Occasionally, two molecules gets transported at the same time in opposite direction.
Sodium ions are removed from the cell while potassium ions are taken in.