Open the combination lock using the old combination. Remove the u-bar from the lock body so it's in the Unlock position. Use a screwdriver to open the anti-dust cover on the back of the combination lock. Align the old combination numbers to the guide points.
A base pair (bp) is a unit consisting of two nucleobases bound to each other by hydrogen bonds. They form the building blocks of the DNA double helix, and contribute to the folded structure of both DNA and RNA.
The AU pair and GC pair are known as Watson-Crick base pairs. These are the most commonly encountered type of base pairs in double-stranded regions of RNA. The geometry of these two pairs in double-stranded RNA is nearly identical. The geometry of the GU pair differs from that of the AU and GC pairs.