Active Transport

Question 1

Define active transport

Answer 1

The movement of molecules from a region of low concentration to a region of high concentration against the concentration gradient require metabolic requires in the form of ATP involves a carrier protein

Question 2

Active transport using a the sodium/potassium pump

Answer 2

1. Na+ binds to a specific complementary receptor site
2. ATP binds to the protein and is hydrolysed into ADP and a phosphate molecule
3. energy is released but the phosphate molecule remains bound to the carrier
4. The carrier protein changes sharps and Na+ are released on the other side of the membrane
5. K+ now bind to their receptor sites cause the carrier protein to change shape again
6. K+ and phosphate are released on the original side of the membrane leaving the carrier protein to pick up more Na+

Question 3

What does active transport require

Answer 3

Energy from ATP