Viruses.

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Presentation transcript:

Viruses

Virus Structure Nucleic acid encased in a protein coat (capsid)

Viral Replication Only reproduce when they enter a host cell They lack ribosomes and enzymes necessary for protein synthesis and simple metabolism

Viral Genome Structure dsDNA ssDNA dsRNA (reo) ssRNA Serve as mRNA (+) Serve as template for mRNa (-) Serve as template for DNA (retro)

Bacteriophages Virsus that attack bacteria Two types of reproductive cycles Lytic Lysogenic

Lytic and Lysogenic Cycles

HIV is a Complex Animal Virus CD4 receptors Endocytosis Reverse Transcriptase DNA Incorporation Produces genome for new virus Assemble HIV particles Exit by budding or lysis

Treatment AZT – Blocks replication Protease inhibitors – blocks building of capsid

Treatment Chemokines Blocking Receptors Defective HIV genes