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Bacteria and parasites Bacteria classification

Bacteria and parasites Bacteria classification - Bacteria...

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Bacteria and parasites Bacteria classification How are Bacteria Classified? Bacteria can be classified using: Morphology o cocci (s: coccus) – more-or-less spherical o bacilli (s: bacillus) – more-or-less rods o in-betweens (cocco-bacilli) o others - spirals o may be in clumps or chains Cell wall chemistry o The Gram stain depends on the on the composition of the cell wall which is either: Mostly all peptidoglycan; Mostly lipopolysaccharide (LPS) with a thin layer of peptidoglycan inside the LPS layer Other features e.g. specific biochemical attributes Ultimately DNA sequence Peptidoglycan The peptido– part of peptidoglycan is short peptides incorporating some D-amino acids; These are attached to the –glycan part which is a polymer alternating N-acetyl glucosamine (NAG) and N-acetyl muramic acid And there is cross-linking Lipopolysaccharide The lipo- part is lipid A which is a dimer of N-glucosamine diphosphate with multiple long chain
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