<prompt> Which part of DNA is most susceptible to radiation?NucleotidesNucleosidesHistonesDouble helix  <response>: D Double helix Relatively flexible areas of the DNA double helix are most susceptible to damage. Radiation can damage the DNA double helix - a two-stranded, twisting molecule - in a variety of ways: 1 by knocking off one or more of the DNA bases known by the letters A, T, G, and C, which form the bonds between the two strands of the double helix; 2 by oxidizing these bases; or 3 by breaking through one or both strands. All can result ir a failure of the molecule to perform its main task - telling cells which proteins to make. That can lead to out-of-control cell growth cancer or death. 