M. smithiiconverts CO2 to methane in a series of enzymatic steps requiring hydro

Question

M. smithiiconverts CO2 to methane in a series of enzymatic steps requiring hydrogen. When inhabiting the human intestine, what is the source of this hydrogen for this reaction? Choose one: A. It is produced by microbial fermentation of ingested food. O B. It is produced by hydrogenotrophs coexisting in the gut. O C. It enters the gastrointestinal tract when air is accidentally swallowed during eating D. It is generated as a by-product of respiration by intestinal epithelial cells. Part 2 (1 point) OSee Hint As a form of respiration, methanogenesis involves an electron transport system (ETS) that can be cou across the membrane. In addition to just protons, however, methanogens create a tra proposed mechanism for how these archaea utilize the Na potential? pled to translocation of ions nsmembrane gradient of sodium ions. What is the Choose one: O A. to make the medium more salty B. to transport H2 and Co2 into the cell C. to bring H+ into the cell via an antiporter D. to power ATP synthesis 11 OF 16 QUESTIONS COMPLETED 07:16 > MacBook P

Explanation / Answer

ANS. A. it is produced by microbial fermentation of ingested food.

M. smithii is a hydrogenotrophs (use hydrogen). it converts hydrogen (produced during dietary fermentation) and CO2 to methane.

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