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.
Quick Answer. Base pairing is the specific bonding of complementary nucleotide bases to one another in a nucleic acid. In base pairing, a purine bonds with a pyrimidine; specifically, guanine forms a bond with cytosine, and adenine bonds with either thymine or uracil, depending on the type of nucleic acid involved. Continue Reading.