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The number of different proteins in a small virus is limited chiefly by

  • A.the small size of its genome
  • B.the thickness of the envelope
  • C.the temperature of the host
  • D.the shape of the capsid

Answer: A

A genome only a few thousand bases long can encode very few proteins, which is why small viruses reuse one coat protein many times over and often cut a single polyprotein into several products. Economy of coding is the constraint that shapes their whole strategy.

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