Question

The rate at molecules, such as water and oxygen, enter a cell is determined by the ?

A. Permeability of the cell membrane
B. Mass of the nucleus
C. Size of the cell
D. Primary function of the cell

Answer 1

A. Permeability of the cell membrane is the answer

Answer 2

A
Cell membranes allow small molecules such as oxygen, water carbon dioxide and glucose to pass through, but do not allow larger molecules like sucrose, proteins and starch to enter the cell directly.