40. Which molecules require 5-phosphoribosyl-1-pyrophosphate (PRPP) for biosynthesis? 1) arginine,2) phenylalanine, 3) histidine; 4) tryptophan, 5) tyrosine, 6) methionine.
(A) 1,6
(B) 2, 5
(C) 3, 4
(D) 4, 6

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