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Microorganisms growing on a particular substrate can oxidize a second substrate called as __________

(a) co substrate

(b) sugar substrate

(c) potassium substrate

(d) calcium substrate

The question was posed to me during an online interview.

This key question is from Cometabolic Degradation of Organic Pollutants topic in chapter Biodegradation of Organic Pollutants of Environmental Biotechnology

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The correct option is (a) co substrate

To elaborate: When microorganisms growing on a particular substrate can oxidize a second substrate known as co substrate which is not assimilated but the product can be used as a substrate, whereas, sugar substrate, potassium substrate, calcium substrate are certain forms of substrate.

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