BY4 - Microbiology
- Created by: beth-marie2511
- Created on: 07-06-16 16:04
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- BY4 - Microbiology
- The study of micro-organisms.
- Classification of Micro-organisms
- 4 main groups of micro-organisms:
- Bacteria
- Protoctista
- Fungi
- Viruses
- Uses a variety of factors:
- Shape
- Metabolic reactions
- Gram Stain experiment
- Singular
- Coccus
- Spherical
- Bacillus
- Rod
- Spirillum
- Spiral
- Coccus
- Plural
- Diplobacilli
- Streprobacilli
- Spirilla
- Diplococci
- Streptococci
- Diplobacilli
- 4 main groups of micro-organisms:
- Gram Stain
- Gram Negative
- Gram negative bacteria have a thinner cell wall.
- Made up of peptide-glycans.
- Does not retain the crystal violet stain.
- They have an outer layer of lipopoly-sccharides.
- Does not retain crystal violet stain.
- Lipids in the cell walls.
- Crystal violet stain is insoluble in lipids.
- A red counter stain - safranin - is used to stain gram negative bacteria.
- Crystal violet stain is insoluble in lipids.
- Contain poly-peptide chains that have cross-linkages with other peptide chains.
- Not affected by anti-bacterial enzymes (lysozymes).
- Which come from human tears.
- Resistant to penicillin and other antibiotics.
- Gram negative bacteria have a thinner cell wall.
- Gram Negative
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