Kingdom for virus???? (Do they even have a kingdom?)

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Presentation transcript:

Kingdom for virus???? (Do they even have a kingdom?) Virus Ch 18.1

Warts are a skin virus!

Virus structure: Protein Coat DNA or RNA for replication Adsorb-tion site Host specific

Are viruses living or non-living? Not cells Few of life’s criteria No respiration No growth No development Can be crystalline, dormant Living Replicate (with host) Contain DNA,RNA Contain protein coat

4..Bacteriophage Bacteria “eating” virus Virus uses the bacteria as a host For Viral replication

Plant peach virus 5.Virus can infect Plants Animals Bacteria

Herpes mouth virus:

Chicken Pox & Polio Virus

Rabies virus Hepatitis B (Liver)

Cow pox vaccination 1749 Acquired Immunization Artificial injection of a small amount of virus Body’s immune response makes antibodies

Lytic Cycle (Replication) of a Virus - “AVIRAL” Viral DNA Adsorption of virus onto the host 5.Lysis of Host cell Membrane & release Of virus 4. Assembly of protein coat 2. Insertion of Virus DNA into host cell

Viral Replication:

HIV virus structure:

HIV Virus

HIV virus infects T-cells HIV virus Weakens the immune system AIDS patients die of “common” diseases when T cell (WBC) count falls

AIDS = break down of the immune system & death due to common diseases versus death by AIDS virus

Transduction: Viral DNA becomes inserted Into the Bacteria DNA (1/100,000)

Genetic Engineering of Insulin

Restriction Enzymes:Made by some Bacteria