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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Q10: The pyrimidine ring system is shown below.
Q11: _ is a precursor for the de
Q11: Which structure below is PRPP? 
Q12: The purine ring system is shown below.
Q14: Which is a method by which the
Q16: Four of the ten enzymes required for
Q17: The purine ring system is shown below.
Q18: Which amino acid is not directly involved
Q19: The first nucleotide product in the de
Q19: The pyrimidine ring system is shown below.
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