Compare and contrast the utilization of H2S by a purple phototrophic bacterium and by a colorless sulfur

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Compare and contrast the utilization of H2S by a purple phototrophic bacterium and by a colorless sulfur bacterium such as Beggiatoa. What role does H2S play in the metabolism of each organism?
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Brock Biology of Microorganisms

ISBN: 978-0321897398

14th edition

Authors: Michael Madigan, John Martinko, Kelly Bender, Daniel Buckley

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