By: Jodi Cameron and Connor

Replication of a virusStep 1: Attachment (entrance)Virus attaches to the host cellInjects its DNA/RNA into bacteriumStep 2: Synthesis DNA/RNA replicates with bacterium Step 3: AssemblyBacteriophage protein and genetic material

are assembledStep 4: ReleaseViruses are released, host cell dies

Virus Life Cycle

Structure of a virus

Are viruses living?Researchers first discovered agents that behaved like

bacteria but were much smaller and caused diseases such as rabies and foot-and-mouth disease, it became the general view that viruses were biologically "alive.".

This perception changed in 1935 when the tobacco mosaic virus was crystallized and it was shown that the particles lacked the mechanisms necessary for metabolic function.

Once it was established that viruses consist merely of DNA or RNA surrounded by a protein shell, it became the scientific view that they are more complex biochemical mechanisms than living organisms.

http://serc.carleton.edu/microbelife/yellowstone/viruslive.html

Different types of viruses

Herpes

Vaccine

Common virus

Immune systemYour immune system is like an army. To boost your immune system you take a booster or a

vaccine Vaccines are weak or fake version of the virus, so

your body can fight these viruses quicker and easier so when they come encounter with these viruses in full dosses your body will react quickly and send the antibodies to kill the virus.

The reason you take a vaccine is because as soon as you get a virus the doctors can do very little on help fight it.

It is all up to you immune system and its little army called anti bodies.

http://www.guardian.co.uk/science/video/2010/nov/01/immune-system-viruses-cells

VirusesA viruses habitat is a host cellIt contains nucleic acid and a protein capsidThere is no cure for a virus, it can only be

prevented by a vaccine

Pictures of different viruses Herpes Virus

Common Cold Virus

H1N1 Virus

Meningitis Virus

Fun factsThe name virus was coined from the Latin

word meaning slimy liquid or poisonThere are a million virus particles per ml

of seawater – for a global total of 1030 virions! Lined up end to end, they would stretch 200 million light years into space.

The smallest known viruses are circoviruses, which are 20 nanometers (0.00002 millimeters) in diameter. The viral genome is 1,700 nucleotides in length and codes for two proteins.