What is a Virus? Particle of nucleic acid and protein which reproduce only by infecting living cells.

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Presentation transcript:

What is a Virus? Particle of nucleic acid and protein which reproduce only by infecting living cells

Do viruses qualify as living things? Much smaller and less complex than cells Consist of either DNA or RNA enclosed in a protein coat called a capsid Do not grow Have no nucleus, cytoplasm, or membranes Do not carry out cellular functions or generate metabolic energy

Do viruses qualify as living things? NO…They are obligate intracellular parasites, meaning that they require a host cell to reproduce.

Lytic Cycle

Lytic Cycle (Viral Reproduction) DOCKING with the host receptor protein PENETRATION of the viral nucleic acid into the host cytoplasm BIOSYNTHESIS of the viral components Assembly (MATURATION) of the viral components into complete viral units RELEASE of the completed virus from the host cell

Lysogenic Cycle

Retroviruses Use RNA instead of DNA

Prions Protein infectious particles Contain no RNA or DNA

Interferon Protein produced by cells when exposed to a virus. This protein binds to the cell membranes of neighboring cells and "interferes" with the ability of a virus to enter the cell.

Small Pox

Polio

Herpes Simplex

Hepatitis

Varicella Zoster

Mumps

Measles - Rubeola

Other Viruses Influenza Virus Rubella Parvo-virus Epstein Barr Virus Hanta Virus (HPV) Human Papilloma Virus (RSV) Respiratory Syncytial Virus Rabies Rhinovirus Rotavirus West Nile Virus