BIOLOGY 2EE3 Chapter Notes - Chapter 2: Glycosidic Bond, Atp-Binding Cassette Transporter, Magnetotactic Bacteria
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Some bacteria are very rich in iron because of membrane enclosed magnetite particles (magnetosomes) These bacteria use the earth"s magnetic field in order to orient themselves and travel. Magnetotactic bacteria prefer environments with little or no oxygen. Bacteria use this ability to direct themselves towards areas which are anoxic. This process is magnetic-aerotaxis by which they find the desired oxygen concentration by moving a long a magnetic field. Shape of bacterial cell caused by organization of cell wall. Coccus is spherical; bacillus is rod, vibrio is curved rod, spirillum is spiral. Ecoli is rod shaped; vibrio cholerae is vibrio; staphylococcus aureus is spherical; treponema pallidum is spirrilium. Morphology itself is not enough to classify bacteria. Ecoli are individual cells; other bacteria like bacillus anthracis or streptococcus pyogenes form long chains and physically connected after division. Staphylococci usually produce irregular clumps rather than chains. Some bacteria do not create regular shapes but create variable shapes called pleiopmorphic.