Which are purines?
A) Adenine and thymine.
B) Guanine and adenine.
C) Cytosine and thymine.
D) Uracil and guanine.
Correct Answer:
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Q9: The pyrimidine ring system is shown below.What
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Q12: The first step in the de novo
Q14: The purine ring system is shown below.What
Q15: Which structure below is PRPP? 
Q16: Four of the ten enzymes required for
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Q18: The purine ring system is shown below.What
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