Practice question

Murray's 1968 division of bacteria based on cell envelope architecture introduced the term Gracilicutes from Latin gracilis meaning thin and cutis meaning skin, designating Gram-negative organisms possessing a thin peptidoglycan layer surrounded by an outer membrane containing lipopolysaccharide. This contrasts with Firmicutes possessing strong thick walls and Mollicutes lacking walls. Gracilicutes concept aligns with diderm architecture, periplasmic space, and sensitivity to detergents, grouping proteobacteria, bacteroidetes, and other Gram-negative taxa historically. The name persists in classical literature for Gram-negative bacteria distinct from monoderm lineages.