The pyrimidine ring system is shown below. What is the source of the N-1 during the de novo biosynthesis of pyrimidines? 
A) aspartate
B) urea
C) asparagine
D) IMP
Correct Answer:
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Q14: Which is a method by which the
Q15: Which are purines?
A) adenine and thymine
B) guanine
Q16: Four of the ten enzymes required for
Q17: The purine ring system is shown below.
Q18: Which amino acid is not directly involved
Q19: The first nucleotide product in the de
Q21: Which catalytic site is not contained in
Q22: Which is not a direct precursor of
Q23: The conversion of UTP to CTP involves
Q24: The pyrimidine ring system is shown below.
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