Bacteria have methods of exchanging DNA between individuals ("horizontal gene transfer") that termites (presumably) do not.

http://en.wikipedia.org/wiki/Bacterial_conjugation

(Also, it's you're just stating a singe data point ("Bacteria have a biomass comparable to plants and animals") it's rather annoying to not actually state it and to instead just give a cite, forcing the reader to click on your link to find out something they could have just read. It's as if I had only said "Bacteria are different than termites" and had given you my link.)