PRESCOTT'S MICROBIOLOGY
PRESCOTT'S MICROBIOLOGY
11th Edition
ISBN: 9781264073375
Author: WILLEY
Publisher: MCG
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Chapter 20.1, Problem 1CC
Summary Introduction

Archaea are categorized into six groups based on morphological and physiological differences. However, Bergey’s manual of systemic bacteriology, a taxonomic organization divides archaea into two phyla such as Crenarchaeota and Euryarchaeota. However, the third phylum such as Thaumarchaeota was recently documented. All methanogenic microorganisms that belong to Euryarchaeota are known as methanogens. There are three types of carbon fixation that have been characterized in archaea. This includes the reductive acetyl-CoA pathway, dicarboxylate/4-hydroxybutyrate cycle (DC/HB), and the 3-hydroxypropionate/4-hydroxybutyrate cycle (HP/HB).

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