I've presented this before I think: Bacterial colonies use chemicals to communicate and to adapt group behavior. It is all at the molecular level, and I conclude DNA manages it since sRNA (small) are used:-http://www.newscientist.com/article/dn17390-why-microbes-are-smarter-than-you-thought.html- http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3730234/