Which of the Following Is NOT Correct Regarding the Biosynthesis

question 44

Multiple Choice

Which of the following is NOT correct regarding the biosynthesis of purines and pyrimidines?

• A) 5-phosphoribosyl-1-pyrophosphate (PRPP) is a precursor to both purines and pyrimidines.
• B) The pyrimidine ring is synthesized first and then linked to 5-phosphoribosyl-1-pyrophosphate.
• C) The purine ring is built around the C1 of 5-phosphoribosyl-1-pyrophosphate.
• D) Both purines and pyrimidines use inosine monophosphate as a precursor.
• E) Both purines and pyrimidines are built by adding carbon components to ribose 5-phosphate.

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