Viruses

1
Viruses
2
Is a Virus Living?

• Life Chemicals

• Cant Reproduce
• Cant make or use E
• Cant Respond
• No Growth or Development
• Isnt a cell
• (no organelles and no cell membrane)

3
Parasites and Hosts

• Host organism that provides energy for a
  parasite
• Parasite organism that harms a host to obtain
  energy

4
Viruses are Very Small
5
Viral Structure

• Protein Coat
• 1) Attaches to Host
• 2) Protects DNA
• DNA
• 1) Take control of the host cell to make it
  replicate viruses

6
Viral DNA

• Life Chemicals

• Almost 70 of human DNA contains pieces of viral
  DNA

7
Active Virus

• IMMEDIATELY takes over the host cell and begins
  to replicate

8
Hidden Virus

• Viral DNA becomes part of host and will replicate
  at some point later