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 The hydrogen bonding of complementary nitrogen bases, one purine and one pyrimidine. Base-pairing occurs between the complementary strands of a DNA molecule or a DNA/RNA hybrid, and in the complementary pairing of codons and anticodons during the process of translation.