<prompt> Putrescene - a polyamine is formed by decarboxylation of:ArginineOrnithineCitrullineAdenine  <response>: Ans: B OrnithineRef: Harpers Illustrated Biochemistry,28th editionExplanation:Polyamines include putrescine, spermidine, spermine.Ornithine is a major precursor for synthesis of polyamines.Conversion of ornithine to putrescine is catalyzed by Ornithine Decarboxylase. See figure 