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Published byBethany Griffith Modified over 8 years ago
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MICROORGANISMS: Bacteria
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DOMAINS
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Tree of Life: Universal ancestor led to 3 Domains
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Bacteria and Archaea are two types of Prokaryotes All are all single- celled & microscopic Unique Domains From Eukaryota Syntrophic organisms (feeding together) Archaea in the picture in red, sulfate reducing Bacteria in green.
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What are the smallest living things? Bacteria How small are they?.2 micrometers in diameter
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BACTERIA
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Bacteria are classified by shape
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Spiral Shaped Spirilla or Spirochete Spirochete or Spirilla
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Bacteria arrrangements
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Bacteria are named by how they stain purple/blue pink
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Gram staining is an empirical method of differentiating bacterial species into two large groups (Gram-positive and Gram-negative) based on the chemical and physical properties of their cell walls. Bacteria have a cell wall made up of peptidoglycan. Gram-positive bacteria have a thick mesh-like cell wall; gram-negative bacteria have a thin cell wall and an outer phospholipid bilayer membrane.
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The cells with a thick cell wall appear blue (gram positive) as crystal violet is retained within the cells, and so the red dye cannot be seen. Those cells with a thin cell wall, and therefore decolorized, appear red (gram negative).
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Bacteria reproduce by binary fission Rod-Shaped Bacterium, hemorrhagic E. coli, strain 0157:H7 (division) (SEM x22,810).
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How do bacteria get nutrition? Photoautotrophy (photosynthesis) Chemoautotrophy (chemicals are carbon and energy supplier) Photoheterotrophy (sun supplies energy but carbon comes from nearby organic molecules) Chemoheterotrophy (decomposition of decaying materials)
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LAB BACTERIA
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A. Bacillus subtilis
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B. Serratia marcescens
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C. Lactococcus lactis
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D. Bacillus cereus
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E. Escherchia coli
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