Bacterial cell reproduction proceeds by binary fission, and new cell material is assembled through a hierarchical biosynthetic pathway: fueling reactions produce precursor metabolites and energy (ATP, reducing power), which are converted into building blocks (amino acids, sugars, fatty acids, nucleotides), polymerized into macromolecules (proteins, lipids, polysaccharides, nucleic acids), and finally assembled into cellular structures. Bacteria are classified by nutritional strategy along two independent axes — carbon source (organic vs. carbon dioxide) and energy source (chemical/inorganic vs. light) — yielding heterotrophic (chemoheterotroph, photoheterotroph/organotroph) and autotrophic (chemoautotroph, photoautotroph) modes of growth, a core organizing framework in microbiology and metabolic biology.
Bacterial cell reproduction proceeds by binary fission, and new cell material is assembled through a hierarchical biosynthetic pathway: fueling reactions produce precursor metabolites and energy (ATP…