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Viruses are Infectious Packages of Genetic Information Life Cycle of a Virus

Bacterial Viruses are Known as Bacteriophage

Lysogeny or Latency by Integration

The Great Diversity of Viruses

Small Single-Stranded DNA Viruses of Bacteria

Complex Bacterial Viruses with Double Stranded DNA

DNA Viruses of Higher Organisms

Viruses with RNA Genomes Have Very Few Genes

Bacterial RNA Viruses

Double Stranded RNA Viruses of Animals

Positive-Stranded RNA Viruses Make Polyproteins

Strategy of Negative-Strand RNA Viruses

Plant RNA Viruses

Retroviruses Use both RNA and DNA Genome of the Retrovirus Subviral Infectious Agents Satellite Viruses

Viroids are Naked Molecules of Infectious RNA Prions are Infectious Proteins

FIGURE 17.01 Viruses Consist of Protein plus DNA or RNA

A simple virus contains a genome of RNA (blue) or DNA (pink) surrounded by a protein coat.

FIGURE 17.01 Viruses Consist of Protein plus DNA or RNA

A simple virus contains a genome of RNA (blue) or DNA (pink) surrounded by a protein coat.

Viruses are sub-cellular parasites that rely on a cell to provide energy and raw material.

Virus particles contain DNA or RNA protected by a shell of protein.

A key property of a living cell is that it possesses its own ribosomes for making proteins. Viruses do not contain ribosomes but use the host cell ribosomes to make proteins.

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