Molecular Oxygen (O₂), Which Is Required for the Production of ATP

question 57

Multiple Choice

Molecular oxygen (O₂) , which is required for the production of ATP by mitochondria, must pass through at least three membranes to get to the enzymes where it is used. O₂ is also produced in chloroplasts and must pass through at least four membranes to be released from the plant. How does O₂ move across biological membranes?

• A)There are numerous protein transporters that allow O₂ to travel across membranes.
• B)O₂ is nonpolar and very small, so it can move by simple diffusion across the membrane.
• C)O₂ undergoes a chemical reaction that binds it to other substances that are transported across the membranes.
• D)O₂ is hydrophilic and travels with water across the membranes.

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