LIFE 121 Lecture Notes - Lecture 6: Facultative Anaerobic Organism, Anaerobic Respiration, Marsh Gas
Document Summary
Simpler walls; more peptidoglycan: gram negative stain red. More complex walls with outer membrane of lo\popolysacchardies; less peptidoglycan. Gram negative pathogens more virulent than gram : motility, some species have flagella= whip-like structures on surface, may cover cell surface or concentration at one or both ends, differ from eukaryotic flagella. Are not extensions of the cell membrane: prokaryotic flagella composed of. Thick walled plant cells inhibit diffusion o2 from soil into nodules. Plant tissue produce leghemoglobin: red, fe containing protein similar to hemoglobin which binds o2 low o2 levels in modules: rhizobium plant: mutualism. Bacterium obtains carbohydrates produced by plant photosynthesis: crop rotation: annual rotation between legume crop and non legume cro, ammonia from nodules leak into soil fertilization, legumes plowed under release of n when decomposes. Fish die due to decrease o2 in h2o resulting from decay of dead cyanobacteria by microorganisms. Some species of cyanobacteria (e. g. anabaena) produce neurotoxins = poisons affect nervous system death.
