Dr. Mysoon Al-Ansarifac.ksu.edu.sa/sites/default/files/561_mic_1a_0.pdf · 2015-02-10 · Budding...
Transcript of Dr. Mysoon Al-Ansarifac.ksu.edu.sa/sites/default/files/561_mic_1a_0.pdf · 2015-02-10 · Budding...
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Dr. Mysoon Al-Ansari
Reference BROCK
BIOLOGY OF MICROORGANISMS
ELEVENTH EDITION
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The Tree of Life
• Comparative ribosomal RNA sequencing has defined the three domains of life: Bacteria, Archaea, and Eukarya.
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Prokaryotic Diversity
• Several lineages are present in the domains Bacteria and Archaea, and an enormous diversity of cell morphologies and physiologies are represented there.
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Cell Structure • Two structural types of cells are recognized: the prokaryote and the eukaryote. Prokaryotic cells have a simpler internal structure than eukaryotic cells, lacking membrane-enclosed organelles.
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Bacterial Morphology • Some typical bacterial morphologies include coccus, rod, spirillum, spirochete, appendaged, and filamentous.
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Cytoplasmic Membrane • The cytoplasmic membrane is a highly selective permeability barrier constructed of lipids and proteins that forms a bilayer with hydrophilic exteriors and a hydrophobic interior.
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• The major function of the cytoplasmic membrane is to act as a permeability barrier, preventing leakage of cytoplasmic metabolites into the environment.
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