This Day in History: 06/19/1953 - Rosenbergs executed. In This Day in History video clip: On this day in 1953, Julius and Ethel Rosenberg, who were convicted of conspiring to pass U.S. atomic secrets to the Soviets, are executed at Sing Sing Prison in Ossining, New York. Both refused to admit any wrongdoing and proclaimed their innocence right up to the time of their deaths, by the electric chair.
The bond linking a phosphate group to a sugar of a another molecule is called a phosphodiester bond.
Within a strand - via phosphates which link carbon 3 of deoxyribose on one nucleotide with carbon 5 on the deoxyribose of the next nucleotide producing a sugar- phosphate backbone to the chain. Across strands - via base pairing - H bonds between A & T; G & C. Bonds Between Nucleotides. The nucleotide backbone is held together with covalent bonds called phosphodiester bonds. The bond is comprised of C-O-P-O-C. The bond across the strand is comprised of hydrogen bonds. For A-T links, there are 2 H bonds and for G-C links, there are 3 H bonds.