Viruses and Bacteria

By: Pierce, Kortnee, Asia, Casie


  • Viruses
    • Not made of cells
    • Less than or equal too 1/100th of a prokaryotic cell
    • They contain DNA or RNA (Never both)
  • Archaebacteria
    • Has cell was made out of peptidoglycan
    • Found in very harsh environments with extreme temperatures
  • Eubacteria
    • Has cell wall that is NOT made out of peptidoglycan
    • It's found mostly everywhere
  • All Bacteria are/have:
    • Prokaryotic
    • Have loose DNA (circular)
    • Them have: cytoplasm ,cell membrane, cell wall, capsid, and ribosomes  


  • There are three common types of viruses:
    • DNA viruses
    • RNA viruses
    • Prion viruses
  • 2 types of bacteria:
    • Archaebacteria
    • Eubacteria

How it causes infection

  • Viruses can only reproduce if their is a host cell that is the exact shape based on capsid.
  • 2 types Lytic and Lysogenic
  • Lytic undergoes Transcription and and translation for replication of the virus genome.
  • Lysogenic forms a new set of genes called a prophage. Prophage copies and passes down the future generations.

How it reproduces

  • Bacteria causes infection by chemicals called toxins which damages tissue.
  • Bacteria reproduces by fission. The single cell divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two

Common examples of different types

Common viruses include Cold, Flu, Dengue Fever, Ebola, and AIDs. Common Bscterias include Anthrax, Clorea, Leprosy, Lyme Diesease, and TB.

How to prevent or treat

Viruses inhabit living cells, reproduce, then destroy them before moving on. Therefore you cannot target the cell when trying to kill viruses, which antibiotics do. Viruses are very hard to destroy once they are in the body. So we must prevent them even getting ahold of the body. To fight viruses we strengthen the immune system with vaccinations.

Bacteria inhabits cells and uses their energy to survive and grow. Therefore we use antibiotics to target these cells and kill them.

How it is good

  • Bacteria helps clean up the environment through bioremediation
  • Bacteria fixes nitrogen for plants
  • Helps you digest food
  • Used to make some forms of medication
  • Sometimes it doesn't destroy the host

How it is bad

  • Pathogenic bacteria make destroy the host cell
  • Some pathogenic bacteria releases toxins which poison surrounding cells
  • Destroys the host