Why Do Cells Not Have Membrane Transport Proteins for O₂

question 12

Multiple Choice

Why do cells not have membrane transport proteins for O₂?

• A) Because they need to keep the oxygen concentration low inside the reducing environment of the cell.
• B) Because oxygen can dissolve in water and leak in via water channels.
• C) Because oxygen can dissolve in the lipid bilayer and diffuse in and out rapidly without the need for a transporter.
• D) Because oxygen is transported in and out of the cell in special oxygen-carrying proteins such as hemoglobin.
• E) Because oxygen transport across a membrane is energetically unfavorable.

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