Hard to say. Depends on which bacteria, how long, and what was the cause for the change. If you're talking about bacteria today, then it's
really hard to say, since organisms of the future don't yet exist and thus do not have names.
That's not as flippant as it sounds. One organism will not be able to evolve into another
already-existing type of organism; at best, it might evolve into something convergently similar to an existing organism (e.g.,
four-o clocks and cacti, or flying squirrels and sugar gliders). So it makes no sense to argue that evolution cannot turn a horse into a cat. Evolution can turn a species of horse only into either another species of horse or into something that does not exist and is therefore as yet unnamable.