Question

Which of the following molecules could pass through the plasma membrane by simple diffusion?

A. Na+ ions
B. Glucose
C. Amino acids
D. Carbon dioxide

Answer 1

Answer: (D) Carbon Dioxide

Explanation: Carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. Small uncharged lipid molecules can pass through the lipid innards of the membrane.

Answer 2

The molecule that can pass the membrane by simple diffusion is Carbon dioxide. That is option D.

The plasma membrane is a flexible membrane that allows the passage of materials in and out of the cell through the process of diffusion.

The transport of molecules through the plasma membrane is of the following benefits to the cell:

• obtain oxygen and nutrients
• excreting toxic substances as a result of metabolic activities
• maintaining a suitable pH for enzyme activities.

Molecules can pass through the plasma membrane through;

• Simple diffusion

• Osmosis and

• Facilitated diffusion

In simple diffusion, non polar substances such as carbon dioxide and oxygen can pass through the plasma membrane freely once a concentration gradient is existing between the cell and its environment.

Therefore, the molecule that can pass the membrane by simple diffusion is Carbon dioxide.

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