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The protein shell that encloses a viral genome is the

  • A.matrix
  • B.capsid
  • C.envelope
  • D.peplomer

Answer: B

The capsid is built from many copies of one or a few proteins that self-assemble into a symmetric shell, protecting the nucleic acid and taking part in attachment. The envelope, where present, lies outside the capsid and is membrane rather than protein.

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