Bacteria constitute a distinct domain of life characterized by single-celled prokaryotic organization, lacking a membrane-bound nucleus and possessing cell walls containing peptidoglycan. This classification relies on formal differentiation between heterotrophic and autotrophic metabolic strategies, alongside morphological variations such as cocci, bacilli, and spirilla. The concept establishes that while bacteria and archaea share prokaryotic cellular architecture, they represent separate evolutionary branches defined by distinct biochemical compositions and environmental adaptability.
Bacteria constitute a distinct domain of life characterized by single-celled prokaryotic organization, lacking a membrane-bound nucleus and possessing cell walls containing peptidoglycan. This classi…