You are nitpicking. Granted, I understand your desperation to find something, anything in fact, that I say that is "wrong", but semantics aren't going to help rectify your blatant logical errors (such as those in all of your dishonest responses to Post #557). Obviously there are going to be technical discrepancies between what I say at a layman's level from what really needs to be said at a dilletante's and especially an expert's level.
In this particular instance, it isn't even important that there may be variations of double-helix shapes. What is important is that we differentiate between various DNA strands based not upon "shapes" but rather upon which life form they can construct, and of course the way that we tell what they can create is by examining the data stored in the DNA strand's sequence of bases.
Actually (and I'm sure N will correct me if I'm in error), the shape is often what counts in terms of activity at least for proteins.