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Foetal bovine serum is added to culture medium chiefly to supply

  • A.antibiotics to prevent contamination
  • B.growth factors and attachment proteins
  • C.the oxygen the cells will respire
  • D.the plastic surface for cells to grow on

Answer: B

It is an undefined mixture that varies between batches, which is why laboratories test each batch and why defined serum-free media are increasingly used. Batch variation can change a result without anything else altering.

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