have 3 billion base pairs of DNA
one of the nucleic acids
found in the nucleus of eukaryotic cells
structure- four bases and a backbone, backbone is located on the outside of the bases. bases run on the inside and rungs of a ladder. made of two base pairs and they pair up.
hydrogen are easily broken apart

during cell division
the backbone splits apart, the enzyme moves along the DNA and makes copies of the base
DNA turns into RNA

DNA probe
is a molecule labeled with dye that is used to locate the sequence of DNA strands