<prompt> Polyamine like putrescine is derived from:ArginineOrnithineYohimibineArginosuccine  <response>: Ans. b Ornithine Polyamines like spermine, spermidine and putrescine metabolite are produced from L-ornithine by action of ODC ornithine decarboxylase. S-Adenosylmethionine, the methyl group donor for many biosynthetic processes, also participates directly in spermine and spermidine biosynthesis. 