Prokaryotic cells

• Structure of bacterial cells:

  • Cell wall
  • Capsule
  • Cell membrane
  • Circular DNA loop
  • Plasmids
• Structure of a virus:

  • Capsid
  • Nucleic acid
  • Lipid envelope
  • Attachment proteins
• Why are viruses described as non-living?

  • Cannot carry out metabolic processes
  • Cannot reproduce - require a host cell to do this
  • Do not respond to stimuli