The purine ring system is shown below. What is the source of the nitrogen atoms 3 and 9 during the de novo biosynthesis of purines? 
A) aspartate
B) glycine
C) arginine
D) glutamine
Correct Answer:
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Q1: Which is the source of the ribose
Q8: Which enzyme catalyzes the step in purine
Q9: The pyrimidine ring system is shown below.
Q10: The pyrimidine ring system is shown below.
Q11: Which structure below is PRPP? 
Q11: _ is a precursor for the de
Q14: Which is a method by which the
Q15: Which are purines?
A) adenine and thymine
B) guanine
Q17: The purine ring system is shown below.
Q19: The first nucleotide product in the de
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