The Pyrimidine Ring System Is Shown Below

question 5

Multiple Choice

The pyrimidine ring system is shown below.What is the source of the carbons 4,5 and 6 during the de novo biosynthesis of pyrimidines?

• A)Glutamine.
• B)Aspartate.
• C)3 bicarbonate ions.
• D)Pyruvate.

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