Archaeon grew and produced methane

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A researcher lacked the necessary equipment to measure methane production so instead monitored CO2 concentration as an unknown archaeon grew and produced methane. Why might CO2 NOT decrease while methane would still increase?

A) An alternative carbon source such as methanol was used.

B) CO2 is not a carbon source used by methanogens.

C) CO2 was used as an electron donor but not as a carbon substrate.

D) Methanogenic Archaea containing carboxysomes likely made measuring small losses of CO2 difficult to conclude.

According to my study guide, the answer is A but I'm not sure why. Sometimes the study guide lists incorrect answers as the right ones though so I'm afraid it may not be A at all.

Reference no: EM132391310

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