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Haemagglutinin of influenza virus is responsible for

  • A.releasing progeny virions from the cell surface
  • B.copying the RNA genome
  • C.forming the matrix beneath the envelope
  • D.binding the virion to the host cell receptor

Answer: D

Haemagglutinin is the attachment protein, and its name comes from its ability to clump red cells in the laboratory by binding their surface sialic acid. Neuraminidase performs the opposite office, cleaving sialic acid so that new particles do not stick to the cell they came from.

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