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Bacteria - PowerPoint PPT Presentation

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Bacteria

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  1. Bacteria

  2. - “pro” = before - “karyon” = nucleus NO nucleus NOorganelles Small, less complex Circular DNA, floats in cytoplasm i.e. Bacteria - “eu” = true - karyon” = nucleus Have nucleus Organelles Large, complex Linear DNA, in nucleus i.e. Plants & Animals Prokaryotes vs. Eukaryotes

  3. 2 Kingdoms of Prokaryotes

  4. First Photosynthetic Prokaryote Oxygen is produced in oceans and creates ozone Cyanobacteria

  5. 3 Shapes • 1. Coccus (round) • 2. Bacillus (rod) • 3. Spirillum (sprial) Staphylococcus aureus Escherichia coli Streptococcus pyogenes

  6. Gram-staining • Method used to classify bacteria into 2 groups: Gram-positive vs. Gram-negative • stains peptidoglycanin cell walls of the bacteria

  7. Endospores • Specialized “resting” cells • dormant cell formed by certain bacteria that can survive very harsh conditions (heat, cold, poison)

  8. Example – Closdridiumbotulinum • Caused from improper canning • Produces neurotoxins that lead to paralysis

  9. Movement • Flagella – long whip-like tails • pili – short projections which allow them to stick to their hosts, their environment or each other.

  10. Asexual Reproduction – Binary Fission

  11. Methods of ObtainingEnergy • Photosynthesizers • Chemoautotrophs • Heterotrophs

  12. Bacteria Lab • Which locations at NMHS have the most bacteria? Cell Phone Bacteria