Pathways include the complete glycolytic pathway, the citric acid cycle and Electron Transport System .   Amino acid biosynthesis and the production of purines are complete, however of the pyrimidines, the cytidine production pathway lacks the final cytidine triphosphate synthetase, hence, cytidine cannot be synthesized.  In order for C. diphtheriaeto to colonize the host, it needs this pyrimidine base.  What is this nutrient requirement called, and from where does the bacterium obtain it?

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