Virus? Warts are a skin virus! Characteristics of Protist No Nucleus Ring of DNA Asexual Reproduction.

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Presentation transcript:

Virus?

Warts are a skin virus!

Characteristics of Protist No Nucleus Ring of DNA Asexual Reproduction

Virus structure : Protein Coat Has DNA or RNA for replication Host specific

Are viruses living or non-living? Nonliving Not cells Few of life’s criteria No respiration No growth No development Can be crystalline, dormant Living Replicate (with host) Contain DNA or 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” 1.Adsorption of virus onto the host 2. Insertion of Virus DNA into host cell 3. Replication of Viral DNA 4. Assembly of protein coat 5.Lysis of Host cell Membrane & release Of virus

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