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Which of these are acetotropic methanogens?

(a) Methanoculleus thermophilicus, Methanosphaera stadtmanii

(b) Methanosarcina thermophila, Methanosaeta concilii

(c) Methanosarcina thermophila, Methanosphaera stadtmanii

(d) Methanoculleus thermophilicus, Methanosarcina thermophila

I had been asked this question by my school principal while I was bunking the class.

Question is from Microbial Production of Fuels in section Bioleaching and Biomining for Recovery of Resources of Environmental Biotechnology

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Right answer is (b) Methanosarcina thermophila, Methanosaeta concilii

To explain I would say: Methanosarcina thermophila and Methanosaeta concilii, both are acetotropicand it also comes under the archaea group. While Methanosphaerastadtmanii and Methanoculleus thermophilicus are hydrogenotrophics.

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