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NEET Biology Evolution Of Life Question Bank Self Evaluation Test - Evolution

  • question_answer
    Desulfovibrio is a bacterium that breaks down organic matter which it must have and uses sulphate not oxygen as an electron acceptor. As a result, it produces hydrogen sulphide (\[{{H}_{2}}S\]), accounting for the 'rotten egg' smell of swamp muck. Oxygen is a deadly poison to Desulfovibrio. We would call Desulfovibrio a(n):

    A) facultatively anaerobic chemoautotroph.

    B) obligately anaerobic chemoheterotroph.

    C) facultatively aerobic chemoheterotroph.

    D) obligately anaerobic chemoautotroph.

    Correct Answer: B

    Solution :

    [b] Obligate anaerobes are poisoned by oxygen. Chemoheterotrophs must consume organic molecules for both energy and carbon.


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