PROKARYOTIC CELLS AND VIRUSES

• What are features of prokaryotic cells?

  Flagella for movement,

  plasmid (small circular DNA, usually contain genes for antibiotic resistance),

  long loop of chromosomal DNA found in nucleoid region,

  murein cell wall,

  capsule (mucus that protects the cell from its environment/ immune system of host),

  plasma membrane (cell surface membrane),

  ribosomes (70s),

  may contain chlorophyll and/or enzymes for respiration embedded in the membrane
• What are features of viruses?

  Genetic material (DNA/RNA), capsid protein encapsulates DNA,

  Matrix (mesh of fibres),

  lipid envelope (helps enter host cells, not in all viruses),

  attachment proteins that attach to receptors on host cell to gain access
• What does a virus need to survive?

  It is acellular (non living) needs a host to survive
• What is the size of a virus?

  It is smaller than bacteria, 20-300nm
• What is the size of a prokaryote?

  0.1-10um
• PROKARYOTIC CELL

  
• VIRUS