MICR 2430 Chapter Notes - Chapter 18,19,20: Mycelium, Sulfuric Acid, Halococcus
3 Apr 2015
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Chapter 18 (bacterial diversity) cell shapes include rods, cocci, spirals, and budding forms. possess a cell wall of peptidoglycan. composed of disaccharide peptide chains that can cross link in three dimensions. variant forms of peptidoglycan distinguish different species: a phylum (plural, phyla) is defined as a group of organisms sharing a common ancestor that diverged early from other bacteria, based on small subunit rrna sequence, thermotoga maritima is a sulfur reducing respirer, originally isolated from a geothermal vent in volcano, italy. The cycle of endospore formation was probably present in the common ancestor of this phylum: nonsporulating firmicutes include pathogenic rods such as listeria, as well as food producing bacteria such as lactobacillus and lactococcus, staphylococcus and streptococcus are gram positive cocci that include normal human flora, as well as serious pathogens causing toxic shock syndrome, pneumonia, and scarlet fever, mycoplasmas belong phylogenetically to firmicutes but lack the cell wall and s layer.
