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Growth factors are

  • A.Mineral salts
  • B.Ammonium salts
  • C.Hydrogen, carbon, nitrogen
  • D.Essential substances that bacteria cannot synthesise for themselves

Answer: D

Correct answer: Essential substances that bacteria cannot synthesise for themselves

A growth factor is an organic compound - a vitamin, amino acid, purine or pyrimidine - that an organism must have but cannot make, so it has to be supplied in the medium. Mineral salts and the bulk elements are nutrients, but they are not growth factors.

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