Archaea can be 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 Crenarchaeota and Euryarchaeota . 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). The dicarboxylate/4-hydroxybutyrate cycle (DC/HB) is an autotrophic pathway, which occurs commonly occurs in two Crenarchaeota family includes, Desulfurococcales and Thermoproteales .

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Chapter 20, Problem 2CHI

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Archaea can be 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 Crenarchaeota and Euryarchaeota. 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). The dicarboxylate/4-hydroxybutyrate cycle (DC/HB) is an autotrophic pathway, which occurs commonly occurs in two Crenarchaeota family includes, Desulfurococcales and Thermoproteales.

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