Viruses.

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Presentation transcript:

Viruses

Key Viral Parts Head/Capsid: Protects DNA or RNA Constructed of protein Genome/DNA: Instructions for replication (composed of nucleic acids) Tail Fibers: Attach to host cell; made of protein

Characteristics of Living Things Made of cells Respond to stimuli Adapt to environment Obtain & use energy Grow & develop Reproduce

Viral Characteristics Require other cells (from host) in order to survive Do not need food to survive Not cellular BUT, they do use DNA or RNA as a replicating molecule… So… living or not?

Definitions Virus: Non-cellular; contain genetic information & protein; invade living cells to reproduce Viruses are VERY specific to their host… They will only infect specific organisms (ex. plant viruses won’t affect humans)

Lytic Cycle Diagram Phage DNA Bacterial chromosome New phages Phage attaches to host cell and injects DNA Phage DNA forms circle New phage DNA and proteins are synthesized Bacterium lyses (bursts), releasing new viruses

Lysogenic Cycle d. Prophage e. Replicated bacterial chromosome with prophage 5. Phage DNA incorporates into bacterial chromosome 6. Bacterium reproduces, passing prophage to daughter cells 7. Colony of infected bacteria forms 8. Prophage leaves bacterial chromosome & initiates lytic cycle