Which Statement CORRECTLY Describes the Biosynthetic Pathway for Purine Nucleotides

question 92

Multiple Choice

Which statement CORRECTLY describes the biosynthetic pathway for purine nucleotides?

• A) Purine deoxynucleotides are made by the same path as ribonucleotides, followed by reduction of the ribose moiety.
• B) The first enzyme in the path is aspartate transcarbamoylase (ATCase).
• C) The nitrogen in the purine base that is bonded to ribose in the nucleotide is derived originally from glycine.
• D) The pathway occurs only in plants and bacteria, not in animals.
• E) The purine rings are first synthesized, then condensed with ribose phosphate.

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