Rosenbergs executed. 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.
Bonds between linking nitrogenous bases of two DNA strands are Hydrogen bonds with 3 H-bonds connecting cytosine and guanine and 2 H-bonds connecting adenine and thymine, while the bonds between the stacking of DNA are kept in close contact via van der waals interactions.
When complementary sequences of base pairs on opposing DNA strands are aligned, hydrogen bonds form between positively charged hydrogen atoms and negatively charged oxygen atoms within the structure of the base pairs. These hydrogen bonds add additional stability to the DNA double helix.