What are the key features of eukaryote DNA?

DNA, or deoxyribonucleic acid, is a doubled-stranded helix made up of nucleotides. Each nucleotide has one of four bases attached to it. The bases of the nucleotides of one strand base pair to the complimentary base on the other strand. The four bases are A, T, C and G, and have the complimentary base pairings of A-T and C-G. These base pairs are held together by weak bonds called hydrogen bonds, which can be broken easily by enzymes in the processes of mitosis and meiosis.
DNA is made up of small sections known as genes, which code for the amino acid sequence required to build proteins in the cell. Each gene codes for a specific protein. In eukaryotes, the DNA is found in the nucleus of the cell, bound up very tightly into structures known as chromosomes. Diploid organisms, which include humans, have 2 copies of every chromosome per cell - one from the mother and one from the father. Humans have 23 pairs of chromosomes (46 in total).