Biology 1442 Week 1 notes for exam 2
Biology 1442 Week 1 notes for exam 2 POLS 2311
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This 2 page Class Notes was uploaded by Kristin O'Flaherty on Wednesday March 2, 2016. The Class Notes belongs to POLS 2311 at University of Texas at Arlington taught by Dr. Boyea in Spring 2016. Since its upload, it has received 166 views. For similar materials see US Government in Political Science at University of Texas at Arlington.
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Clutch. So clutch. Thank you sooo much Kristin!!! Thanks so much for your help! Needed it bad lol
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Date Created: 03/02/16
2/22 in a heterogenous environment, many bacteria exhibit taxis, the ability to move toward or away from a stimulus chemotaxis is the movement toward or away from a chemical stimuli bacteria flagella are composed of a motor, hook and a filament many of the flagella’s proteins are modified versions of proteins that perform other tasks in bacteria prokaryotic cells usually lack complex compartmentalization prokaryotic genome has less DNA than the eukaryotic genome most of the genome in a circular chromosome chromosome not surrounded by a nuclear membrane big differences between pro. and eu. in DNA replication, transcription, and translation pro. can divide every 13 hours Key features: o small o reproduce binary fission o short generation times pro. have considerable genetic variation contribute to this genetic diversity: o rapid reproduction o mutation o genetic recombination offspring are generally identical mutation rates during binary fission are low but because of rapid reproduction mutations can accumulate rapidly in a population their short generation time allows for the mutations to stick genetic recombination contributes to diversity transformation: picking up foreign DNA transduction: stealing DNA and moving it around in nitrogen fixation some prokaryotes convert atmospheric N2 to N3 bacteria are good at cooperating exchange metabolic products surfacecoating colonies called biofilms know the big facts of each domain (bacteria or archaea) bacteria: o proteobacteria o alpha proteobacteria is the bacteria that scientists think that mitochondria evolved from o beta proteobacteria converts ammonium to nitrate o gamma proteobacteria, i.e. E. coli, is the gut bacteria and not normally pathogenic o delta proteobacteria o epsilon proteobacteria causes stomach ulcers, or blood poisoning o chlamydia causes blindness and urethritis by sexual transmission o spirochetes causes syphilis or Lyme disease o Cyanobacteria are photoautotrophs that generate O2 o grampositives decompose soil, anthrax, leprosy, black plague, botulism, Staph or Strep which are pathogenic o mycoplasmas are the smallest known cells
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