The cell wall in Gram staining can be depending on how it reacts with chemicals / with
antibiotics
- Gram positive = purple / blue
Eg. MRSA
- Gram negative = red
Eg. E. coli
VIRUS
Non-living
Much smaller than bacteria (few nm)
All natural viruses cause disease
Parasites (use animals/people as hosts)
Can only reproduce inside living cells and adapt quickly to them
BACTERIOPHAGE: invade bacterial cells
Cell Anatomy
DNA/RNA surrounded by a protein capsule
Takes over the metabolism and the genetic material of the host cell by
● inserting its viral DNA
● To reproduce
● New viruses burst out of the cell, destroying it and go on to infect other cells
Eg. Influenza, Tobacco mosaic virus
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