The First Step in the De Novo Biosynthesis of IMP

question 65

Multiple Choice

The first step in the de novo biosynthesis of IMP is a reaction between glutamine and PRPP.Which statement is not true about this reaction?

• A)An amine group is attached to the anomeric carbon atom of the ribose ring.
• B)The configuration of the anomeric carbon atom is inverted from β to α.
• C)A pyrophosphate is lost from PRPP.
• D)The reaction is catalyzed by glutamine-PRPP aminotransferase.

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