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.
Base-pairing holds the double-stranded DNA molecule together. 1  Base-pairing is necessary for DNA synthesis, RNA synthesis, and Protein synthesis to occur. 2  Base-pairing can occur between two strands of DNA, between two strands of RNA, or between one strand of DNA and one strand of RNA.