Viruses - Cellular Pirates

Viruses - Cellular Pirates

Viruses Cellular Pirates Adenovirus showing icosahedral shape Varicella zoster virus

causes chickenpox Characteristics of Viruses Obligate Intercellular Parasite - Must reproduce(replicate) inside a host Structure

- Nucleic Acid DNA or RNA - Protein coat called a capsid - Envelope some contain a layer of membrane taken from a host cell Mutate Rapidly

Host Specific - can only infect one type of cell Small from 20nm to 250nm - most are too small to be seen with a light microscope

Virus Structure Bacteriophage Bacteriophages are viruses that infect bacteria

- they are responsible for transduction in bacteria Viruses have two life cycles Lytic Cycle-Viruses-immediately infect the

host cell Lysogenic Cycle - lay dormant in the cell Lytic Cycle Small Pox- Lytic

Jenner developed first vaccine 1798 Lysogenic Cycle Herpes Simplex 1/Lysogenic

Shingles-Lysogenic/ Chicken pox virus (herpes varicella-zoster) Lytic and Lysogenic Cycles Retroviruses

Contain RNA and not DNA - to be able to take over a host cell, the retrovirus must be able to convert the RNA into DNA

- to accomplish the conversion, retroviruses insert an enzyme called Reverse Transcriptase into the host cell Retroviruses

Vocabulary Obligate intercellular parasite Capsid Envelope bacteriophage Lytic Cycle

Lysogenic Cycle Phage prophage Retrovirus Reverse Transcriptase

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