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The Pyrimidine Ring System Is Shown Below

Question 55

Multiple Choice

The pyrimidine ring system is shown below. What is the source of the N-3 during the de novo biosynthesis of pyrimidines? The pyrimidine ring system is shown below. What is the source of the N-3 during the de novo biosynthesis of pyrimidines? A) ammonia B) glutamine C) arginine D) urea


A) ammonia
B) glutamine
C) arginine
D) urea

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