PROKARYOTE (EXTERNAL)

PROKARYOTE (EXTERNAL)

1. Cell that lack nucleus cell

2. Domains

   • Archaea
   • Bacteria

3. Shapes

   • coccus
     • diplococci, staphylococci,streptococci
   • Bacillus
     • diplobacilli, streptobacilli 
   • Spiral
     • vibrio, sprillum, spirochetes
   • unusual
   • Pleomorphic
   • No fixed shape

4. External structures to cell wall

   • Glycocalyx
   • Flagella
     • monotrichous
     • lophotrichous
     • amphitrichous
     • peritrichous
   • Axial filaments
     • bundles of fibrils that arise at the ends of cell beneath outer sheath
   • Fimbriae and pili
   • cell wall
     • composed of a macromolecular network called peptidoglycan
     • types
       • Gram +
         • thick peptidoglycan layer 
       • Gram -
         • very few layers of peptidoglycan
     • Functions
       • 1. prevent bacterial cell from rupturing from pressure 2. contributes to pathogenicity 3.classification 4.maintains shape 5. provides rigid platform