Directions
Read the following questions. Choose the right answer.
There is only ONE correct answer to each question.
The movement of a molecule from a medium of lower concentration to a medium of higher concentration is called:
- active transport
- permeability
- osmosis
- diffusion
Show answer
Correct answer: A. active transport
Why
Moving a substance against its concentration gradient (low to high) requires energy — this is active transport, unlike diffusion/osmosis which go with the gradient.