The purine ring system is shown below. What is the source of the carbon atoms 2 and 8 during de novo biosynthesis of purines? 
A) carbon dioxide
B) aspartate
C) 10-formyltetrahydrofolate
D) glutamine
Correct Answer:
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Q11: _ is a precursor for the de
Q12: The purine ring system is shown below.
Q14: Which is a method by which the
Q15: Which are purines?
A) adenine and thymine
B) guanine
Q16: Four of the ten enzymes required for
Q18: Which amino acid is not directly involved
Q19: The first nucleotide product in the de
Q19: The pyrimidine ring system is shown below.
Q21: Which catalytic site is not contained in
Q22: Which is not a direct precursor of
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