Biology 19.2
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Transcript

  • 1. 19.2 Viruses
  • 2. Virus
    Particle made up of nucleic acid, protein, and in some cases lipids that can replicate only by infecting living cells.
  • 3. Capsid
    Outer protein coat of a virus.
  • 4. Bacteriophage
    Virus that infects bacteria.
  • 5. Lytic Infection
    Process in which a virus enters a cell, makes copies of itself, and causes the cell to burst.
  • 6. Lysogenic Infection
    Process in which a virus integrates its DNA into the DNA of the host cell, and the viral genetic information replicates along with the host cell’s DNA.
  • 7. Prophage
    The viral DNA that is embedded in the host cell’s DNA.
  • 8. Retrovirus
    Virus that contains RNA as its genetic information.
  • 9. Key Concept
    What is the structure of a virus?
    A typical virus is composed of a core of DNA or RNA surrounded by a protein coat.
  • 10. Key Concept
    How do viruses cause infection?
    In a Lysogenic infection, a virus integrates its DNA into the DNA of the host cell, and the viral genetic information replicates along with the host cell’s DNA. In a Lytic infection, a virus enters a cell, makes copies of itself, and causes the cell to burst.