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Viruses Living or Not ??????? Characteristics of Viruses Among the smallest biological particles that are capable of causing diseases in living organisms Constructed of compounds associated with cells Not Considered Living A virus is not a bacteria, fungus, protist, plant or animal. They can not carry out cellular functions. A virus can not replicate without infecting cells and then using the organelles and enzymes of the cells of the host. Some scientists argue that viruses are considered living. What characteristics of life do viruses exhibit that could support this theory? Be prepared to share your answer… A Virus Has Two Essential Features A Nucleic Acid DNA or RNA But not both A Capsid – a protein coat surrounding the nucleic acid. Some may have a membrane like structure outside the capsid called an envelop Examples: Influenza Chickenpox Herpes-simplex HIV Viral Shape The shape of the virus is determined by either its capsid or its nucleic acid Two examples of shape Icosahedron has 20 trianglular faces -- herpes simplex, chicken pox and polio Helix is a spiral shape ( like DNA) -- rabies, measles and tobacco mosaic virus How Do Viruses reproduce? REPLICATION Steps of Viral Replication 1. The virus attaches to a host cell 2. The virus injects its information into the host cell 3. Viral parts are reproduced by using the Host cell’s DNA 4. Viral parts are assembled to create new viruses. 5. Viruses fill host cell. Cell bursts (Lysis) to release new cells. How do we remember this???? Create a pneumonic device to remember the steps of Viral Replication. Basic Virus Structure Genetic material Head/ Capsid Tail fibers