Bacteria Essay

1390 Words Dec 27th, 2014 6 Pages
BACTERIA
Morphology Unicellular Prokaryotic Extracellular Appendages flagella, fimbriae, pili Peptidoglycan alternating NAG and NAM protein reinforced by peptide crosslinks Plasmid extra circular DNA used for transferring resistance and toxicity
Physiology
Nutrition photoautotroph and chemoautotroph Metabolism- aerobic and anaerobic Reproduction - Binary Fission rapid transverse cell division resulting to two equally sized daughter cells
Habitat
Ubiquitous Soil Water Air Living Organisms
Pathogenicity
Adhesion bacteria uses fimbriae to attach to surfaces ; sex pilus to attach to other bacteria Resistance increased by the type of cell wall, and presence of endospore, capsules, slime layers Toxin the
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Amoeba, Plasmodium
Metabolism: Endosymbiotic provides essential functions inside other organisms e.g. Trichonypmha in termite gut
Reproduction: binary fission ; schizogony ; conjugation
Schizogony multiple fission ; several daughter cells are dividing and forming from a large parent cell
Conjugation differs from bacteria; involves fusion of plasma membrane and exchange of micronuclei Habitat Water : ponds, lakes Soil : humus Host: Plant/ Animal
Pathogenicity
Encystment shrinking of cytoplasm and thickening of cell membrane leads to dormancy of a protozoa Analogous to bacterial endospore ; contributes to resistance, survival, & reproduction
Trophozoite active, feeding stage
Merozoite first phase; newly produced protozoa; infective stage Taxonomy accd to means of locomotion SARCODINA pseudopods: Amoeba ; Naegleria
CILIOPHORA cilia: Paramecium ;

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