Which is a common precursor in the de novo synthesis of purine nucleotides?
A) inosine 5ʹ-monophosphate
B) xanthosine monophosphate
C) orotate
D) adenylosuccinate
Correct Answer:
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Q1: The purine ring system is shown below.
Q1: Which is the source of the ribose
Q4: The purine ring system is shown below.
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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