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
Q3: Which amino acid is not directly involved
Q4: The purine ring system is shown below.What
Q5: The pyrimidine ring system is shown below.What
Q6: The purine ring system is shown below.What
Q7: Which enzyme catalyzes the step in purine
Q8: The pyrimidine ring system is shown below.What
Q9: The pyrimidine ring system is shown below.What
Q10: A ribose sugar is added to _
Q11: _ is a precursor for the de
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