What base pairs do dna and rna share, and what is different?

DNA and RNA share many characteristics. They are both composed of nucleotide monomers and are read in the 5'-to-3' direction. They also share the same complementary base pairs, except RNA uses uracil in place of thymine; both contain adenine.DNA and RNA base pairing is slightly different since DNA uses the bases adenine, thymine, cytosine, and guanine; RNA uses adenine, uracil, cytosine, and guanine.Uracil differs from thymine in that it lacks a methyl group on its ring.DNA and RNA perform different functions in humans. DNA is responsible for storing and transferring genetic information while RNA directly codes for amino acids and as acts as a messenger between DNA and ribosomes to make proteins.DNA is stable under alkaline conditions while RNA is not stable.

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.