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Prokaryotic Cell Structure and Function

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Presentation on theme: "Prokaryotic Cell Structure and Function"— Presentation transcript:

1 Prokaryotic Cell Structure and Function

2 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 µm long) Thiomargarita namibiensis, sperical ( µm in diameter.)

3 Shapes of Bacteria Coccus Bacillus Coccobacillus Vibrio Spirillum

4 Spherical Bacteria An average coccus is about micrometer (µm) in diameter. A. Division in one plane. Diplococcus: cocci arranged in pairs Streptococcus: cocci arranged in chains Streptococcus pneumoniae, Streptococcus pyogenes,

5 Spherical Bacteria tetrad: cocci arranged in squares of 4
B. Division in two planes. tetrad: cocci arranged in squares of 4 C. Division in three planes Sarcina: cocci in arranged cubes of 8 sarcina

6 Spherical Bacteria D. Division in random planes
Staphylococcus: cocci arranged in irregular, often grape-like clusters

7 Rod-Shaped Bacteria Diplobacillus Coccobacillus Streptobacillus

8 Spiral-Shaped Bacteria
Spirochete Spirillum

9 Cell Structures Cell Membrane Cytoplasm Cell Wall
Components external to cell wall Flagella Pili Capsule/ Slime layer

10 Cell Membrane Hydrophobic Proteins Bilayer Phospholipid Hopanoids
Triclosan-enoyl transferase Hopanoids

11 Detection of environmental signals
Membrane proteins Structural support Detection of environmental signals ToxR- Vibrio cholera Secretion of virulence factor and communication signals NodI and NodJ-Rhizobia

12 Membrane lipids Phosphoryl heads Fatty acids Negative-phosphatidate
Phosphatidylglycerol Cardiolipin Positive-Phosphatidylethanolamine DNA interaction transporter protein Fatty acids Saturated straight chain (6-22) Unsaturated Oleic acid (cis) Cyclopropane

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