re: You know what it might bee...
Probably not, DNA is a very complex molecule destroyed easily and completely by the process of simple digestion. If this were not the case, organisms would have been routinely acquiring new genetic material and new genes from their food for billions of years. Sex would be unnecessary!
That does sound like a germ (no pun intended)for a great science-fiction plot, though. And viruses and some bacteria can acquire genetic material from the cells and other microorganisms they prey on and parasitize.