Which is not a direct precursor of pyrimidines in their de novo biosynthesis?
A) HCO3-
B) glutamine
C) glycine
D) aspartate
Correct Answer:
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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 pyrimidine ring system is shown below.
Q21: Which catalytic site is not contained in
Q23: The conversion of UTP to CTP involves
Q24: The pyrimidine ring system is shown below.
Q28: Carbamoyl phosphate synthetase I is located in
Q39: Inhibition of ATCase by a _ nucleotide
Q57: The one-carbon group needed to convert dUMP
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