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 name of the double ring nitrogenous bases found in nucleotidesis a double-helix. lemonparty.org. Theyre pyrimidines   Because Adenine and guanine both have two and cytosine and thymine have one. Adenine and guanine molecules are two of the four nitrogenous bases  that help make up the structure of DNA.