Aspartate contains four carbons.If all are radioactively labeled,how many carbons of UMP will be radioactively labeled?
A) 0
B) 2
C) 3
D) 4

Question

Quizplus · Accepted Answer

Aspartate is one of the precursors of UMP (uridine monophosphate). Aspartate has four carbon atoms, and if all of them are radioactively labeled, then three of those carbons will contribute to the formation of carbons in UMP. The fourth carbon will not be incorporated into UMP because it is used to form fumarate, another molecule in the pyrimidine synthesis pathway. Therefore, the correct answer is choice C) 3.

Aspartate Contains Four Carbons