Questions: Which of the following is true about the transportation of substances across the lipid region of the cell membrane? Choose 1 answer: A Small nonpolar molecules can freely dissolve across the lipid region of the cell membrane. (B) Gases such as N2, O2, and CO2 require embedded transport proteins to dissolve across the lipid region of the cell membrane. (C) Polysaccharides can freely dissolve across the lipid region of the cell membrane. D Ions can freely dissolve across the lipid region of the cell membrane.

Which of the following is true about the transportation of substances across the lipid region of the cell membrane?

Choose 1 answer:

A Small nonpolar molecules can freely dissolve across the lipid region of the cell membrane.
(B) Gases such as N2, O2, and CO2 require embedded transport proteins to dissolve across the lipid region of the cell membrane.
(C) Polysaccharides can freely dissolve across the lipid region of the cell membrane.

D Ions can freely dissolve across the lipid region of the cell membrane.

Transcript text: Which of the following is true about the transportation of substances across the lipid region of the cell membrane? Choose 1 answer: A Small nonpolar molecules can freely dissolve across the lipid region of the cell membrane. (B) Gases such as $\mathrm{N}_{2}, \mathrm{O}_{2}$, and $\mathrm{CO}_{2}$ require embedded transport proteins to dissolve across the lipid region of the cell membrane. (C) Polysaccharides can freely dissolve across the lipid region of the cell membrane. D Ions can freely dissolve across the lipid region of the cell membrane.

Solution

The answer is the first one (A): Small nonpolar molecules can freely dissolve across the lipid region of the cell membrane.

Explanation for each option:

A. Small nonpolar molecules can freely dissolve across the lipid region of the cell membrane.

This is correct. Small nonpolar molecules, such as oxygen (O₂) and carbon dioxide (CO₂), can diffuse directly through the lipid bilayer of the cell membrane without the need for transport proteins because they are hydrophobic and can easily pass through the hydrophobic core of the lipid bilayer.

B. Gases such as $\mathrm{N}_{2}, \mathrm{O}_{2}$, and $\mathrm{CO}_{2}$ require embedded transport proteins to dissolve across the lipid region of the cell membrane.

This is incorrect. Gases like nitrogen (N₂), oxygen (O₂), and carbon dioxide (CO₂) are small and nonpolar, allowing them to diffuse freely across the lipid bilayer without the need for transport proteins.

C. Polysaccharides can freely dissolve across the lipid region of the cell membrane.

This is incorrect. Polysaccharides are large and typically polar molecules, which cannot freely pass through the hydrophobic lipid bilayer. They require specific transport mechanisms, such as endocytosis or transport proteins, to cross the cell membrane.

D. Ions can freely dissolve across the lipid region of the cell membrane.

This is incorrect. Ions are charged particles and cannot pass through the hydrophobic lipid bilayer freely. They require specific ion channels or transport proteins to facilitate their movement across the cell membrane.

Summary: Small nonpolar molecules can freely dissolve across the lipid region of the cell membrane, making option A the correct answer.

Was this solution helpful?