BIO153H5 Study Guide - Quiz Guide: Psilotopsida, Gametophyte, Tracheid
Document Summary
Differ from eukaryotes cause they don"t have membrane-bound nucleus. Cells very small (1-2 um and 10 um long) Instead of chromosomal dna , their dna store in plasmid (circular loop) Live in extreme anaerobic environments and called extromophiles . Classified as thermophiles (high temp), halophiles (high salty condiotions),acidophiles (acidic cond), methanogens (methane producers) Quiet small and simple shape except for cynobacteria which is more complex. Serve as decomposers, agents of fermentation, nutrient recyclers, aid in digestion. 1 way of identification: shape: rod-shaped cells = bacilli, sperical shaped = -cocci, spiral shaped = Genus species name may reflect nature of groupings : diplo- (cells occur in pairs), strepto- (form chains), staphylo- (form bunches like grapes) ex. All bacteria classified using gram staining, often first step in identifying unknown bac and also determining resistance to antibiotics. Bac that retain purple colour are gram-positive.
