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.
All DNA base pairs consist of two nucleotides. There are four possible nucleotides for each spot in a pair, meaning that there are 10 possible combinations for a pair in total. The four nucleotides are adenine, cytosine, thymine and guanine, which are typically represented by the letters A, C, T and G, respectively.