Prokaryotic Cell Structure and Function

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Prokaryotic Cell Structure and Function. Size of Bacteria. Average bacteria 0.5 - 2.0 um in diam. RBC is 7.5 um in diam. Pulopiscium fishelsoni , bacillus (80µm in diameter and 200-600 µm long) Thiomargarita namibiensis , sperical (100-750 µm in diameter.). Shapes of Bacteria. Coccus - PowerPoint PPT Presentation

Transcript of Prokaryotic Cell Structure and Function

  • Prokaryotic Cell Structure and Function

  • Size of BacteriaAverage bacteria 0.5 - 2.0 um in diam.

    RBC is 7.5 um in diam.Pulopiscium fishelsoni, bacillus (80m in diameter and 200-600 m long)Thiomargarita namibiensis, sperical (100-750 m in diameter.)

  • Shapes of Bacteria


  • Spherical BacteriaAn average coccus is about 0.5-1.0 micrometer (m) in diameter.

    A. Division in one plane.

    Diplococcus: cocci arranged in pairs

    Streptococcus: cocci arranged in chainsStreptococcus pneumoniae,

    Streptococcus pyogenes,

  • Spherical BacteriaB. Division in two planes.

    tetrad: cocci arranged in squares of 4 C. Division in three planes Sarcina: cocci in arranged cubes of 8 sarcina

  • Spherical BacteriaD. Division in random planes

    Staphylococcus: cocci arranged in irregular, often grape-like clusters

  • Rod-Shaped BacteriaDiplobacillusCoccobacillusStreptobacillus

  • Spiral-Shaped BacteriaSpirocheteSpirillum

  • Cell StructuresCell Membrane


    Cell Wall

    Components external to cell wall Flagella PiliCapsule/ Slime layer

  • Cell MembraneHydrophobic Proteins

    Bilayer Phospholipid Triclosan-enoyl transferase


  • Membrane proteinsStructural supportDetection of environmental signalsToxR- Vibrio cholera Secretion of virulence factor and communication signalsNodI and NodJ-Rhizobia

  • Membrane lipidsPhosphoryl headsNegative-phosphatidatePhosphatidylglycerolCardiolipinPositive-PhosphatidylethanolamineDNA interactiontransporter protein

    Fatty acidsSaturated straight chain (6-22) Unsaturated Oleic acid (cis)Cyclopropane