Which part of DNA is most susceptible to radiation?

(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.