Active Transport

Question 1

What is active transport?

Answer 1

It’s the process of moving molecules and ions across plasma membranes, against a concentration gradient.

Question 2

Active transport involves carrier proteins. Describe the stages of active transport.

Answer 2

1. First, a large molecule attaches to a carrier protein in the membrane.
2. Then, the protein changes shape.
3. This releases the molecule on the opposite side of the membrane.

Question 3

Does active transport use energy (from ATP)?

Answer 3

Yes so the solute can move against its concentration gradient.