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The matrix protein of an enveloped virus lies

  • A.between the nucleocapsid and the envelope
  • B.outside the envelope, exposed to the surroundings
  • C.inside the nucleic acid
  • D.in the host cell nucleus only

Answer: A

Correct answer: between the nucleocapsid and the envelope

The matrix protein forms a layer lining the inner face of the envelope and contacting the nucleocapsid, so it links the two. That position is what makes it structurally important: it gives the envelope its rigidity and it directs assembly, gathering the nucleocapsid beneath the patch of membrane carrying the viral glycoproteins so that budding produces a complete particle.

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