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14 Cards in this Set
- Front
- Back
Function and chemical composition of bacterial structure: Peptidoglycan
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Function: 1. Rigid support 2. Protects against osmotic pressure Chemical composition: Sugar backbone with cross-linked peptide side chains
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Function and chemical composition of bacterial structure: Cell wall/cell membrane - Gram positive
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Gram positives only, Function: Major surface antigen, Chemical composition: Teichoic acid, which induces TNF and IL-1
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Function and chemical composition of bacterial structure: Outer membrane - gram negative
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Gram negatives only, Function: Site of endotoxin (lipopolysaccharide) and major surface antigen, Chemical composition: Lipid A induces TNF and IL-1, and polysaccharide is the antigen
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Function and chemical composition of bacterial structure: Plasma membrane
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Function: Site of oxidative and transport enzymes Chemical composition: Lipoprotein bilayer
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Function and chemical composition of bacterial structure: Ribosome
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Function: Protein synthesis, Chemical composition: 50S and 30S subunits
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Function and chemical composition of bacterial structure: Periplasm
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Function: Space between the cytoplasmic membrane and outer membrane in gram-negative bacteria, Chemical composition: Contains many hydrolytic enzymes, including beta-lactamases
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Function and chemical composition of bacterial structure: Capsule
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Function: Protects against phagocytosis, Chemical composition: Polysaccharide (except Bacillus anthracis which contains D-glutamate)
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Function and chemical composition of bacterial structure: Pilus/fimbria
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Function: Mediates adherence of bacteria to cell surface; sex pilus forms attachment between 2 bacteria during conjugation, Chemical composition: Glycoprotein
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Function and chemical composition of bacterial structure: Flagellum
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Function: Motility, Chemical composition: Protein
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Function and chemical composition of bacterial structure: Spore
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Function: Provides resistance to dehydration, heat, and chemicals, Chemical composition: Keratin-like coat and dipicolinic acid
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Function and chemical composition of bacterial structure: Plasmid
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Function: Contains a variety of genes for antibiotic resistance, enzymes, and toxins, Chemical composition: DNA
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Function and chemical composition of bacterial structure: Glycocalyx
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Function: Mediates adherence to surfaces, especially foreign surfaces (eg indwelling catheters), Chemical composition: Polysaccharide
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Function of this structure: IgA proteases
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Function: Allow some organisms to colonize mucosal surfaces
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Which bacteria have IgA proteases?
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1. Streptococcus pneumoniae 2. Neisseria meningitidis 3. Neisseria gonorrheae 4. Hemophilus influenzae
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