Which enzyme catalyzes the step in purine nucleotide biosynthesis that is the principal site of regulation for the pathway?
A) adenylsuccinate lyase
B) OPM decarboxylase
C) IMP cyclohydrolase
D) glutamine-PRPP amidotransferase
Correct Answer:
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Q1: Which is the source of the ribose
Q4: The purine ring system is shown below.
Q5: Which is a common precursor in the
Q6: The purine ring system is shown below.
Q9: The pyrimidine ring system is shown below.
Q10: A ribose sugar is added to _
Q10: 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.
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