One Way in Which the Anabolism of Pyrimidine Nucleotides Differs

question 14

Multiple Choice

One way in which the anabolism of pyrimidine nucleotides differs from that of purine nucleotides is that

• A) the pyrimidine ring is assembled before being bonded to the ribose phosphate, whereas the purine ring is bonded to the ribose phosphate as it is formed
• B) there is no feedback inhibition in the anabolism of pyrimidine nucleotides, while feedback inhibition is important in the synthesis of purine nucleotides
• C) glycine appears in the pathway for formation of pyrimidine nucleotides but not in that for the formation of purine nucleotides
• D) argininosuccinate is a key intermediate in pyrimidine biosynthesis

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