So that is shown by the following diagram. So this line basically represents the sugar and the phosphate, while these squares represent our nitrogenous bases. And our nitrogenous bases are basically protected and are found inside our double stranded DNA molecule. And that means our bonds can form and those bonds are not disrupted by any type of outside force that is found on the outside of that double stranded DNA molecule. Of course, if we, for example, increase the temperature, eventually a temperature will be reached where these bonds will break, regardless of the fact that our nitrogenous bases are found inside that DNA molecule. So once again, DNA is basically a polymer molecule that contains nucleotides.