Which Does Not Apply to the Diffusion of O₂, CO₂

question 60

Multiple Choice

Which does not apply to the diffusion of O₂, CO₂ and small hydrophobic molecules across a membrane?

• A) Diffusion is driven by the concentration gradient across the membrane.
• B) The diffusion is spontaneous and there is a decrease in free energy as diffusion occurs.
• C) The transport is saturatable.
• D) Membrane proteins are not needed for the diffusion process.

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