Final answer:
DNA is a double-stranded molecule found in the nucleus of eukaryotic cells and in other cellular compartments of both prokaryotes and eukaryotes. It has a double helical structure with repeating nucleotides joined by hydrogen bonds. These hydrogen bonds form the backbone of the DNA strands.
Step-by-step explanation:
Deoxyribonucleic acid (DNA) is a double-stranded molecule found in every living organism. In eukaryotic cells, DNA is located in the nucleus, where it is bound to proteins called histones to form chromosomes. DNA can also be found in the cytosol of prokaryotes and in the mitochondria and chloroplasts of eukaryotic cells.
DNA is composed of two parallel chains of repeating nucleotides, which form a double helix. Each nucleotide consists of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group. The nucleotides are joined together by hydrogen bonds between the nitrogenous bases, forming the backbone of the DNA strands.