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Which one of the following viruses is enveloped?

  • A.Poliovirus
  • B.Adenovirus
  • C.Papillomavirus
  • D.Influenza virus

Answer: D

Influenza virions acquire a lipid envelope by budding, and the haemagglutinin and neuraminidase spikes sit in it. The others are naked, and the difference explains why influenza is inactivated by soap and alcohol far more readily than poliovirus.

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