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The phosphate inhibition in the clavine formation with Claviceps SD58, can be counteracted by the addition of

  • A.alanine
  • B.methionine
  • C.tryptophan
  • D.lysine

Answer: C

Correct answer: tryptophan

Tryptophan is the precursor of the clavine alkaloids and also an inducer of the pathway, so supplying it counteracts the repression that phosphate imposes on Claviceps SD58. It is a useful illustration that a precursor can act as a regulatory signal as well as a substrate.

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