For biology only the magnetic field is of relevance - except for high voltage. In this last case the electrical resistance of the cell membranes would be overcome being directly effective on the cell. For the magnetic field there is no "magnetic" resistance to be overcome. In other words: the magnetic field of electromagnetic waves ALWAYS effect cells of a resonant wave structure. The resonance of the specific electromagnetic waves with the cell respectively parts of the cell depends on the wavelength and its given modulation and structuring of the specific electromagnetic wave.
