Question
Are chemosynthetic bacteria-autotrophic or heterotrophic?
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Answer
Chemosynthetic bacteria are autotrophic bacteria. They are able to manufacture their organic food from inorganic raw materials with the help of energy derived from exergonic chemical reactions involving oxidation of an inorganic substance present in the external medium. Thus, these bacteria are chemoautotrophic. The chemical energy obtained from oxidation reaction is trapped in ATP molecules. Examples are nitrifying bacteria, sulphur oxidising bacteria, and iron bacteria.
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