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Discussion

Phosphate is considered to restrict the induction of

  • A.primary metabolites
  • B.secondary metabolites
  • C.both (a) and (b)
  • D.none of these

Answer: B

Correct answer: secondary metabolites

Phosphate at growth-supporting concentrations represses secondary metabolism - antibiotics, alkaloids, pigments - while primary metabolism, which the cell needs to grow, proceeds. This is why industrial fermentations are often run with phosphate deliberately limited once growth is complete.

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