The purine ring system is shown below. What is the source of the C-6 atom during de novo biosynthesis of purines? 
A) carbon dioxide
B) tetrahydrofolate
C) carbamoyl phosphate
D) glycine
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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.
Q8: Which enzyme catalyzes the step in purine
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? 
Q12: The first step in the de novo
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