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Toxicity due to the accumulation of ammonia can be overcome

  • A.by substituting glutamine by glutamate
  • B.by controlled addition of glutamine at low level
  • C.by removal of ammonia or ammonium from culture medium
  • D.all of the above

Answer: D

Correct answer: all of the above

All three help. Substituting glutamate for glutamine removes the amide nitrogen that becomes ammonia; feeding glutamine slowly keeps its concentration low, so less is deaminated; and removing the ammonium as it forms - by dialysis or by ion exchange - deals with what is produced. All are used in high-density culture.

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