Cocci is one of the three types of shapes of bacterias: cocci (spherical), bacilli (rod-shaped), and spirella, (spiral-shaped)

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v • d • e Microbiology: Bacteria Pathogenic bacteria Bacterial disease · Coley's Toxins · Exotoxin · Lysogenic cycle Human flora Gut flora · Skin flora · Vaginal flora Substrate preference Lipophilic · Saccharophilic Oxygen preference Aerobic (Obligate) · Anaerobic (Facultative, Obligate) · Microaerophile · Nanaerobe · Aerotolerant Structures Cell envelope Cell membrane Cell wall: Peptidoglycan (NAM, NAG, DAP) Gram-positive bacteria only: Teichoic acid · Lipoteichoic acid · Endospore Gram-negative bacteria only: Bacterial outer membrane (Porin, Lipopolysaccharide) · Periplasmic space Mycobacteria only: Arabinogalactan · Mycolic acid Outside envelope Bacterial capsule · Slime layer · S-layer · Glycocalyx Pilus · Fimbria Composite Biofilm Shapes Bacterial cellular morphologies · Coccus (Diplococcus)  · Bacillus · Coccobacillus

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