A polynucleotide molecule is an organic polymer molecule composed of 13 or more nucleotide monomers covalently bonded in a chain. DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) are examples of polynucleotides with distinct biological function. The prefix poly comes from the ancient Greek πολυς (polys, many). Polynucleotides in organisms Polynucleotides occur naturally in all living organisms. The genome of an organism consists of complementary pairs of enormousl… (More on Polynucleotide)