Biochemistry Molecular Genetics c83c67b5 A codon consists of: A One molecule of aminoacyl-tRNA B Two complementary base pairs C Three consecutive nucleotide units D Four individual nucleotides High-Yield Explanation Ans. C. Three consecutive nucleotide units(Ref: Harper 31/e page 399)Each codon consists of a sequence of three nucleotides, i.e. it is a triplet code.