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Characteristics of bacteriacelll wall
- Nearly all bacteria have a cell wall, but in some the wall is G(+) and in others it is G (-).Reproduce asexualy
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Bacterial Structure
- Prokaryotes (can be broken down to 2 types) No nucleus or membrane-bound organelles Contain ribosomesSingle, circular chromosome in nucleoid region
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Shapes Are Used to Classify
- Bacillus: Rod shaped
- Coccus: Spherical (round)
- Vibrio: Comma shaped with flagella
- Spirillum: Spiral shape
- Spirochete: wormlike spiral shape
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Grouping of Bacteria
- Diplo- Groups of two
- Strepto- chains
- Staphylo- Grapelike clusters
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Bacteria can become DORMANT by
forming an endospore
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Which bacteria can form highly resistant, dormant structures called endospores.
- Gram-positive bacteria, such as Bacillus, Clostridium,
- Sporohalobacter, Anaerobacter and Heliobacterium
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Vegetative cells vs. endospores
- •Vegetative cells are metabolically active(if metabolic activity stops its dormant not vegetative)
- • (taking in nutrients, converting nutrients into energy and biomass, expelling wastes, growing and dividing)
- Endospores are dormant—metabolically
- inactive (but contains the genetic material of the vegetative cell)
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How are Archaea and Bacteria different?
- Archaea: (accient bacteria) dna and anatomy resemble more to eukarya and are prokaryotes living in extreme habitats
- Bacteria: Eubacteria (modern bacteria)
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Eubacteria
microscopic single-celled organisms. They are sometimes referred to as the “true bacteria
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The Three Domains of Life
- •Domain Bacteria and domain Archaea
- –Consist of prokaryotes
- Domain Eukarya, the eukaryotes
- –Includes the various protist kingdoms and the kingdoms Plantae, Fungi, and Animalia
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