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
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Q1: Which is the source of the ribose
Q5: Which is a common precursor in the
Q6: The purine ring system is shown below.
Q8: Which enzyme catalyzes the step in purine
Q9: The pyrimidine ring system is shown below.
Q11: Which structure below is PRPP? 
Q11: _ is a precursor for the de
Q12: The purine ring system is shown below.
Q14: Which is a method by which the
Q15: Which are purines?
A) adenine and thymine
B) guanine
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