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Beyond Viruses……

Beyond Viruses…… . Can create an “infection” that can lead to the death of the “infected organism? …appears to be able to replicate itself… …is not a bacteria! …is smaller than a virus? …is not a virus! …contains genetic information! …structurally like the “guts”of a virus!.

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Beyond Viruses……

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  1. Beyond Viruses…… Can create an “infection” that can lead to the death of the “infected organism? …appears to be able to replicate itself… …is not a bacteria! …is smaller than a virus? …is not a virus! …contains genetic information! …structurally like the “guts”of a virus!

  2. VIROIDS: The PlantInvaders… A VIROID is a… VIR(virus)OID(like)particle. Viroids are“sub-viruses” composed exclusively of a single circular strand of nucleic acid (RNA) that codes for a single protein.

  3. VIROIDS: DID YOU KNOW VIROIDS… • are infectious particles. • are smaller than any of the known viruses. • range in size from approximately 20 nm (8 x 10-7 inches) ... • arejust 100 times larger than Atoms which measure in at .1 nanometers. • cause certain plant and human diseases. • consists only of Nucleic Acid (RNA) .

  4. VIROIDS: The Potato “Nose”… Normal Potatoes Infected Potatoes

  5. VIROIDS: The Potato “Nose”… In Class Reading… VIROIDS!

  6. VIROIDS: Are VIROIDs a new form of life? 1- Are VIROIDs made of cells? NO 2- Are VIROIDs organized? YES 3- Do VIROIDsuse energy? NO 4- Are VIROIDs responsive? NO

  7. VIROIDs: Are VIROIDs a new form of life? 5- Do VIROIDs grow? (enlarge and divide) NO 6- Do VIROIDs reproduce? YES ~they recruit their host’s cellular machinery to replicate it RNA using the original as a template 7- Do VIROIDsadapt? YES/NO, ~ do mutate into other viable forms.

  8. VIROIDs: Are VIROIDs a new form of life? 8- Do VIROIDs die? NO, however like all nucleic acids, their structure can be degraded by catalysts or UV light 9- Do VIROIDs come from pre-existing viroids? YES ~ existing VIROIDs are the templates for the next generation of replicants

  9. VIROIDs: Origin & Structure v

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