The pyrimidine ring system is shown below.What is the source of the C-2 during the de novo biosynthesis of pyrimidines? 
A) Aspartate.
B) PRPP.
C) Bicarbonate.
D) Tetrahydrofolate.
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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
Q10: A ribose sugar is added to _
Q11: _ is a precursor for the de
Q12: The first step in the de novo
Q13: Which are purines?
A)Adenine and thymine.
B)Guanine and adenine.
C)Cytosine
Q14: The purine ring system is shown below.What
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