-Use the figure to answer the following question. Which substance requires the use of a protein channel to pass through a plasma membrane?
A) oxygen
B) carbon dioxide
C) water
D) calcium ions

Question

-Use the figure to answer the following question. Which substance requires the use of a protein channel to pass through a plasma membrane?
A) oxygen 
B) carbon dioxide 
C) water 
D) calcium ions

Quizplus · Accepted Answer

Calcium ions are larger and charged particles that cannot freely diffuse through the plasma membrane. Therefore, they require the use of a protein channel to pass through the membrane. Oxygen, carbon dioxide, and water are small, uncharged molecules that can easily pass through the plasma membrane by simple diffusion.

-Use the Figure to Answer the Following Question