L9 - Bacterial Cells I

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9 Terms

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Taxonomy

Science of biological classification

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Classification

the orderly arrangement of organisms into groups based on mutual similarity

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How were microbes initially classified?

Phenotypic characteristics

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Polyphasic taxonomy

Amalgamation of phenetic, phylogenetic, and genotypic information

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Gram positive bacteria

  • No outer membrane

  • Tick peptidoglycan

  • Simple structure

  • Small periplasmic space

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What colour do gram positive bacteria stain

Purple (retain violet dye)

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Gram negative bacteria

  • Outer membrane present

  • Thin peptidoglycan layer

  • Complex structure

  • Larger periplasmic space

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What colour do gram negative bacteria stain?

Pink (do not retain violet dye)

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