Nucleic Acid Structure and General Features

ID #2094

why are DNA chains made of a single phosphate group while the individual monomers are referenced to having three phosphate groups?

The incoming molecule is a triphosphate species, but it has a pyrophosphate group broken off (hydrolyzed) to provide the energy required to form that new covalent bond we're about to form, leaving a single phosphate group on the nucleotide.

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