The two main groups of Archaebacteria are methanogens, halophiles, and thermophiles.
The operon is effectively the center of transcriptional control. In addition to its main structural genes, the operon houses an operator and a promoter. In front of the promoter lies a regulatory gene that produces repressor proteins. When a repressor is in its active state, it binds to the operator.
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Cytoplasm!
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