4.4 Active transport

Question 1

what is active transport?

Answer 1

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

Question 2

how does an Na+ ion go into a cell by active transport?

Answer 2

• higher conc inside the cell
• the Na+ ion binds to the carrier protein
• inside the cell, the ATP binds to the carrier protein
• ATP –> ADP + Pi
• energy released changes shape of the carrier protein
• Na+ ion released
• carrier protein reverts to original shape
• ADP + Pi –> ATP

Question 3

what does the Na+ ion bind to on the carrier protein?

Answer 3

complimentary receptor

Question 4

what does the energy release do to the carrier protein?

Answer 4

causes it to change shape and open the opposite side of the membrane

Question 5

what is the change of shape due to energy called?

Answer 5

conformational change

Question 6

how does the carrier protein revert to its original shape?

Answer 6

Pi released from protein