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The Nature of Viruses: Living or Not?

Explore the characteristics of viruses and why they are not considered living organisms. Learn about HPV, vaccines, prions, and how they differ in structure and impact on health.

daria-murphy
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The Nature of Viruses: Living or Not?

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Presentation Transcript

  1. Question: What does it mean to be "living"? Homework: text p. 487 1-5 (lab) finish Tracking a Plague

  2. Viruses

  3. Virus- • Living or not? • Contains DNA or RNA • Cannot reproduce without help of another cell. • How? • Attaches to cell’s membrane and injectsits DNA/RNA into the cell • codes for the production of the virus, taking over the cell’s functions • Eventually, cell explodes releasing many new viruses

  4. Living? • Living things must be able to: • REPRODUCE! • Since viruses cannot reproduce by themselves, they are NOT considered to be living by most scientists.

  5. Animation- • Virus Animation

  6. What viruses do • HPV • Human papillomavirus • Many viruses thought to affect DNA that regulates cell division • Can lead to unrestricted cell division  cancer!!! • HPV vaccine prevents HPV, which MAY prevent cervical cancers

  7. Vaccine • Weakened virus injected into body • Allows immune system to recognize and kill virus. • immune system remembers the virus, and will kill stronger versions of it in the future. • CANNOT VACCINATE FOR BACTERIA

  8. Even Smaller? • Mad Cow’s Disease • Caused by Prions • NOT incapsulated like virus • No genetic material • Only proteins. • proteins can cause many diseases

  9. Cutting it down to size smallest to largest- • prion • virus • bacteria • eukaryotes • eukaryotic cells work together to make • tissues organs  organ systems  eukaryotic organisms

  10. Question: Why would an antibioticnot have any effect on avirus that you have?

  11. HIV Vaccine? AIDS video

  12. Question: What makes a virusNOT alive? Homework: text p. 487 1-5

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