?Kingdom for virus? (Prokaryota & Monera)

Virus Ch 18.1

Prokaryotes = no membrane bound organelles (no nucleus or mitochondria)

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?

Nonliving 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

PlantsAnimalsBacteria

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 cellMembrane& 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

Transduction:

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

Genetic Engineering of Insulin

Restriction Enzymes:Made by some Bacteria