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How bacteria help in metal extraction?

(a) Oxidation of ore

(b) Reduction of ore

(c) Assimilation

(d) Accumulation

I got this question in unit test.

This intriguing question originated from Microbial Applications for Metal Removal topic in division Microbial Transformation of Heavy Metals of Environmental Biotechnology

1 Answer

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Right choice is (a) Oxidation of ore

The explanation: In metal extraction, the bacteria catalyze the breakdown of the mineral by oxidizing the metal in presence of oxygen, this is how bacteria helps in metal extraction by additional oxidation of ore, whereas, reduction of ore doesn’t take place in this extraction process, assimilation and accumulation is not a part of metal extraction.

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