II. MORPHOLOGY AND

Apuntes

II. MORPHOLOGY AND MICROBIAL CELL STRUCTURE UNITS: • UNIT 2: The Prokaryotic cell. Size, shape and bacterial groupings. • UNIT 3: Surface structures of the bacterial cell (I) • UNIT 4: Surface structures of the bacterial cell (II) • UNIT 5: Prokaryotic nuclear material. Prof. Marina Robas Mora UNIT 2: THE PROKARYOTIC CELL 1. Size . 2. Shape. 3. Bacterial groupings. 4. General structure of the bacterial cells. Prof. Marina Robas Mora 3 PROKARYOTIC CELLS EUkARYOTIC CELLS Prof. Marina Robas Mora The Prokaryotic cell based on the genome, on the 16s r RNA = bacteria 4 Prokaryotic vs. Eukaryotic cell DNA is a single loop DNA is organized into chromosomes Prokaryotic Eukaryotic also no real organelles but they do have ribosmoes 1. Microorganisms size 5 Prof. Marina Robas Mora Relative cell size Escherichia coli: 1-1.5 x 2-6 μm - Staphylococcus aureus: 0.8-1 μm -Bacillus megaterium: 1.6-2 x 3.7-9.7 μm -Epulopiscium fishelsoni: 80 x 200-600 μm - Thiomargarita namibiensis: 100-700 μm (cannot be seen by the naked eye) we need 1 mm size to start distinguishing shapes by the naked eye (growsn on skin) (even bigger than eukaryotic cells) 6 2. Microorganis...