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Unformatted text preview: Prokaryotes: Bacteria and Archaea The Domains of Life:- Prokaryotes- Composed of bacteria and archaea- Bacteria- Eukarya- Archaea- LUCA- Last universal common ancestor What are Prokaryotes?- No membrane enclosed nucleus- No organelles- No mitosis or meiosis- Mostly asexual reproduction- Unicellular- May possess agella- 3 Basic Morphologies- Spherical (cocci)- Red shaped (bacilli)- Spiral (Spirillum) Archaea Versus Bacteria- Bacteria- Has Peptidoglycan cell wall- One RNA Polymerase- No Introns- No Histones- Pathogenic: Causes illnesses- Streptomycin Resistance- Does not grow above 100 C- Archaea- Does not have Peptidoglycan cell wall- Many RNA Polymerase- Has Introns- Has Histones: Proteins that help package chromosomes together- Not pathogenic- Not streptomycin resistance- Grows above 100 C- May be Extremophiles- Thermophiles continue to divide at 121 C- Thermoacidphiles survive at pH 0.3- Halophiles thrive in hyper-saline lakes Endospore- Normally in bacteria- Allows bacterium to survive harsh conditions...
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