I don't think it's a stretch at all to say that the base sequence of DNA, or the residue sequence of a peptide, is digital, and yes, that's what makes reproduction as we know it possible.
Many aspects of life, however, are analog. Magnesium concentrations, membrane polarizations, molecule orientations, temperature, and so on.
Human genome is, effectively, a historical digital record (Nature, DOI: 10.1038/nature10231).