Both of these strands of beaded DNA have 28 rungs, but the strand with more beads is shorter. More is less in this case. Well, more is shorter. What it lost in length, it gained in width.
The short, wide strand has 3mm bugle beads running down the center on the rungs. Otherwise, both strands have have the same beads. In other words, the wide strands has all of the beads in the skinny strand, plus the 28 bugle beads. These include seed beads in sizes 11/0 and 15/0 and 3mm round Swarvoski crystals. Both strands are quite flexible as well. They will bend more than the next photo show, but that's how much they will stay bent without something holding them.
The twist per inch of the narrow strand is nice and even measuring in at about 4 rungs per full twist. The wide short strand is a touch over twisted with about 5 rungs per full twist. The over twist gives it the appearance of having major grooves and minor grooves, like real DNA (however I believe that the reason for the major/minor grooves of the beaded version are different from what's happening with real DNA). The over-twist make the wider strand like a spring. If you pull it lightly, it will stretch, and go back after you let go. The over-twist could be corrected by switching out some of the 3mm round crystals for size 8/0 seed beads, as I used in the original pattern. Size 8/0 seed beads are a bit shorter than 3mm.