Any photon is basically "something which induces motion in a charged particle". That's what it means to be electromagnetic radiation. The intensity to which t

Any photon is basically "something which induces motion in a charged particle". That's what it means to be electromagnetic radiation. The intensity to which that occurs has to do with the electrical potential landscape around that charged particle and the wavelength of that photon. If these two values are close to each other (coupled) then the motion of the charged particle is more likely. Microwave radiation (especially in the GHz range) illuminating DNA has been long known as a phenomenon, of course it does depend on which frequency band in the GHz range you're in, too.