EEB211_Lecture8_Prokaryotes_(Bacteria) notes

EEB211_Lecture8_Prokaryotes_(Bacteria) notes - Lecture 8...

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Difficult because it’s a lot - You should be able to name 3 and illustrate 1 (don’t need to memorize everything, etc...) Only prokaryotes existed before eukaryotes (3500 MY ago to 1500 MY ago) E coli. = standard prokaryotes; (Mycoplasma too) Their own metabolic enzymes, but don’t have their own genes – they are rather complex organisms. They exist on every surface of earth Takes about 20 minutes for doubling. o They grow a lot faster than eukaryotes o They grow quickly if they are fed; haploids allow for faster reproduction Prokaryotes also tend to have genes from other species of prokaryotes. Focus on starred groups (they constitute 99.9% of all organisms) o Some prokaryotes are producers, consumers or hybrids Note moving from lower electronegative elements to more electronegative ones gives off more energy. (Sulfur to oxygen was often exploited by early autotroph prokaryotes). Chemolithoautotrophs [KO1] live in rocks and deep within the earth in terrible conditions (very hot, no oxygen, etc… Note in cyclic photosynthesis the electron is recycled/reused over and over o It has the ability to fix nitrogen (makes it very important). It fixes a large amount of nitrogen in the cycles. Cyanobacteria (though to be green algae) due to their size. o Photo prokaryotes [KO2] use light as a source for obtaining energy. Parasitic are the intracellular and extracellular 3 different categories: o Chemoorganoheterotrophs [KO3] Archaebacteria are newer than eubacteria (even though they are called old bacteria) Eukaryotes may be so much better that they had taken over the niches available. o There are very few reproductive barriers (few species can disperse well and end up in areas where they remain looking for suitable places to live). o They can live for a long time without reproducing (exist/stay in spores?) o Why are there so few described bacteria species? They are just very tiny some haven t been discovered or classified yet. o There are numerous bacteria present in the ocean (that are important in the carbon cycle).
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  • Fall '11
  • JamesL.Gould
  • Bacteria, Archaebacteria

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