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.
In DNA, however, it loses two of these phosphate groups, so that only one phosphate is incorporated into a strand of DNA. When nucleotides are incorporated into DNA, adjacent nucleotides are linked by a phosphodiester bond: a covalent bond is formed between the 5â phosphate group of one nucleotide and the 3â-OH group of another (see below). In this manner, each strand of DNA has a âbackboneâ of phosphate-sugar-phosphate-sugar-phosphate. The backbone has a 5â end (with a free phosphate) and a 3â end (with a free OH group). In the structure below, each nucleotide is drawn in a different color, for clarity.