Picornaviruses: Structure and Genome
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Questions and Answers

What is the diameter of picornaviruses?

  • 20nm
  • 40nm
  • 30nm (correct)
  • 50nm

    • What is covalently bound to the 5’ end of the picornavirus RNA?

  • VPg (correct)
  • Poly(A) tail
  • IRES element
  • 5’ cap

    • What is the function of the internal ribosome entry site (IRES) in picornaviruses?

  • Initiation of translation without a 5’ cap (correct)
  • Polyadenylation of the RNA
  • Protection of the RNA from degradation
  • Transcription of the RNA

    • How many copies of VP4 are present in a mature picornavirus virion?

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