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An embryonated egg is useful for growing viruses because it

  • A.contains no living cells
  • B.is sterile only on the outside
  • C.supplies antibiotics that suppress bacteria
  • D.provides a diversity of cell types

Answer: D

The developing embryo and its supporting membranes offer several different tissues at once, so a single system can support a wide variety of viruses that differ in which cells they can enter. That diversity is what makes the egg valuable rather than any chemical property.

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