Karin Valencia, Imperial College London, discusses DNA Structure and Topology. DNA is a double-stranded macromolecule in which each strand is a polymer of deoxyribonucleotide monomers. The monomers are linked by “phosphodiester bonds” between the 3′ carbon of one deoxyribose molecule and the 5′ carbon of another.

Image courtesy of interviewee. November 28, 2016