Amino acid which contributes to biosynthesis of purine ribonucleotide are all EXCEPT:
Correct Answer: Histidine
Description: Ans. (b) HistidineRef: Harper's Biochemistry, 30th ed. pg. 340-42* N1 of purine is derived from amino group of aspartate* N3 & N9 are obtained from amide group of glutamine* C4, C5, & N7 of the purine ring of nucleotides are contributed by glycine.
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Biochemistry
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