What Roles Do Hydrogen Gas and Carbon Dioxide Play in the Metabolism

question 65

Multiple Choice

What roles do hydrogen gas and carbon dioxide play in the metabolism of methanogens?

• A) Hydrogen gas is their energy source, and carbon dioxide is their terminal electron acceptor.
• B) Hydrogen gas is their terminal electron acceptor, and carbon dioxide is their energy source.
• C) Hydrogen gas is their energy source, and carbon dioxide is their carbohydrate source.
• D) Hydrogen gas is their initial electron acceptor, and carbon dioxide is their energy source.
• E) They use hydrogen gas in respiration, and they use carbon dioxide in photosynthesis.