Which One of the Following Statements Correctly Describes the Biosynthetic

question 57

Multiple Choice

Which one of the following statements 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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