Methanogenesis includes a unique pathway of carbon fixation, called the carbon monoxide ________ pathway, because the key enzyme can fix CO as well as CO₂.

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The unique pathway of carbon fixation used in methanogenesis is called the carbon monoxide (CO) reductase pathway. This pathway is named because the key enzyme, CO dehydrogenase/acetyl-CoA synthase, can fix CO as well as CO2. This ability allows methanogenic archaea to use a wider range of substrates for energy production.

Methanogenesis Includes a Unique Pathway of Carbon Fixation, Called the Carbon