Week 2 BIOB 170 Notes
Week 2 BIOB 170 Notes BIOB 170
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This 2 page Class Notes was uploaded by Isabella Sturgeon on Sunday February 21, 2016. The Class Notes belongs to BIOB 170 at University of Montana taught by Dr. Kevin Murray in Spring 2016. Since its upload, it has received 17 views. For similar materials see Principles Biological Diversity in Biology at University of Montana.
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Date Created: 02/21/16
Week 2 BIOB 170 Notes Prokaryotes Bacteria • Most widespread forms of life • Ecological niches • Metabolic diversity • Distinguishing traits o Flagella apparatus with rotatory function § Stiff and tubular § Powered by basal apparatus o Cell wall § Peptidoglycan in cell wall § Mucilaginous capsule § Gram positive • Dark purple when stained • A lot of peptidoglycan • Treated easily by antibiotics § Gram negative • Pink when stained • Thickened capsule • Lack of peptidoglycan • Resistant to antibiotics • Fimbrae- facilitate adhesion o Genome organization § DNA concentrated in the nucleoid § Large circular DNA § Plasmids • Small independent circles of DNA • Can be transferred § Fimbrae modified to sex pilus to transfer plasmids • Called conjucation o Reproduction § Rapid cell cycle § Binary fission § Lack chromosomes: quicker replication § In conditions are unfavorable an endospore forms o Metabolism § Anabolic: form organic compounds § Catabolic: break down organic compounds § Refers to the biochemistry of energy and carbon acquisition § Two general categories • Autotrophic o Photosynthetic- use light energy to produce organic compounds o Chemosynthetic- oxidize inorganic compounds for energy • Heterotrophic o Photoheterotroph- use light energy and organic source of carbon o Chemohetertroph- use organic source for energy and carbon (THIS IS WHAT HUMANS DO) § Non oxygenic photosynthesis • Use another source than oxygen for the electron source • Like NH4 or HS § Cyanophytes are oxygenic phtotsynthetic • Nitrogen Fixation o All organisms need nitrogen o Most nitrogen is in the atmosphere and unaccesible to bacteria o N2 is inert o Nitrogen fixation changes the N2 to a more usable form like NH4 o Need H+ o If O2 is present nitrogen fixation cannot happen o Heterocyst- location of nitrogen fixation o Rhizobium- in legumes and do nitrogen fixation for the legume • Nitrogen Cycle o Chemical transfer of given element mediated by bacteria o Metabolically diverse o Cyanophytes – Nitrogen fixing photoautotrophs o Pseudomonas- anaerobic heterotroph o Nitrosomonas- chemosynthetic § Use NH4+ to make NO3- o Plants § NO3- to make amino acids