37._____________________ use light as their source of energy and organic molecules such as carbohydrates as their source of carbon. 38.In __________________, atmospheric nitrogen is converted to a more usable form. 39.Viral genomes can be of DNA or ___________. 40.A type of Archaea, known as _________________, use hydrogen gas to reduce carbon dioxide to methane. 41.Bacteriophages that integrate into the host’s genome do so during a _____________ cycle. 42.____________________ is a disease of the respiratory tract caused by the bacterium Mycobacterium tuberculosis. Â Â
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