BIO 200 Lecture 24: Prokaryotes Bacteria, Archaea
1 Dec 2017
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Document Summary
The ability of an individual to hold his/her breath is a polygene traits. Bacteria are responsible for one of the greatest events in the earth"s history. Prokaryotes are separated into 2: eubacteria, archaebacteria. Single cells: no nuclear membrane, cell wall, no organelles such as mitochondria, chloroplasts, er, or golgi. Archaebacteria: originally found to live in unusual environments, e. g. methanogens, halophiles, thermophiles (living in areas of high concentration of methane, salt, or heat, however, they are everywhere. Smallest: oldest (>3. 5 bya, originated in an anaerobic environment (i. e. without o2) Bacteria are everywhere: human body composition, 10 trillion human cells, 100 trillion bacterial cells, 90% of the cells in your body are bacteria, bacterial species living in a human, 5,000 to 35,000 species in the intestine. Reproduction in prokaryotes: binary fission (not mitosis, single cell bacteria cell elongates creates a copy of their dna. Genetic variability in bacteria: high degree of reproduction means high degree of mutation, bacterial transformation:
