a nucleoside C10H13N5O5 composed of guanine and ribose
guanosine
noun(gua-no-sine)
gtp
guanosine
noun(gua-no-sine)
an energy-rich nucleotide analogous to ATP that is composed of guanine, ribose, and three phosphate groups and is necessary for peptide-bond formation during protein synthesis —called also guanosine triphosphate