What is transport protein?

Question

-A protein that moves from place to place in the cell
- A protein that completely spans the membrane, and allows certain molecules or ions to diffuse across the membrane
-a substance that has slightly positive charge on side and a slightly negative charge on the other
- a substance that consists of two or more elements

Answer 1

The correct answer is:
A protein that completely spans the membrane, and allows certain molecules or ions to diffuse across the membrane.