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Which the following bacteria can produce hydrogen from carbohydrates?

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Which the following bacteria can produce hydrogen from carbohydrates?

(a) Clostridium sp.

(b) Syntrophobacter sp.

(c) Syntrophobacter wolinii

(d) Syntrophomonas wolfei

I have been asked this question during an internship interview.

My question is based upon Anaerobic Bacterial Degradation of Biopolymers topic in chapter Biodegradation of Organic Pollutants of Environmental Biotechnology

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Right choice is (a) Clostridium sp.

The explanation: Clostridium sp. and Eubacterium sp. can produce fatty acids and hydrogen from carbohydrates in the fermentative step, whereas, Syntrophobacter sp., Syntrophobacter wolinii are used in the acetogenic step.

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