Water,oxygen,and ____ most freely flow across a cell membrane.
A)calcium
B)positively charged ions
C)magnesium
D)carbon dioxide

Question

Water,oxygen,and ____ most freely flow across a cell membrane.​
A)calcium
B)​positively charged ions
C)​magnesium
D)carbon dioxide

Quizplus · Accepted Answer

Water and oxygen are small molecules that can easily pass through a cell membrane via diffusion. Carbon dioxide is also a small molecule and can diffuse freely across the membrane. However, calcium, positively charged ions, and magnesium are larger molecules and have a charge, making it more difficult for them to pass through the membrane without specific transport proteins.

Water,oxygen,and ____ Most Freely Flow Across a Cell Membrane