View source for DsDNA

Double stranded [[DNA|DNA]] forms a helical structure and is found in this form in the [[Nucleus|nucleus]] of a [[Eukaryotic cell|eukaryotic cell]]. It is comprised of a [[Sense DNA|sense]] and [[Antisense DNA|antisense]] strand that are complementary to each other and these bind to each other according to [[Watson-Crick base pairing|Watson-Crick base pairing]] rules. The [[Nucleotide|nucleotide]] bases that make up DNA are [[Guanine|guanine]], [[Cytosine|cytosine]], [[Adenine|adenine]] and [[Thymine|thymine]]. These bases are abbreviated to G, C, A and T respectively. Guanine always forms three&nbsp;[[Hydrogen bonds|hydrogen bonds]] with cytosine and adenine always forms two hydrogen bonds with thymine. Therefore the [G] = [C] and [A] = [T]. The G-C triple hydrogen bond requires more energy to break than the A-T double hydrogen bond. moreDouble stranded DNA is split into single stranded DNA in the cell during processes such as [[DNA replication|DNA&nbsp;replication]] and&nbsp;[[Transcription|transcription]] of DNA into [[MRNA|mRNA]]. For a cell to fit all of its DNA into the nucleus, it must compress it down into [[Chromosomes|chromosomes]]. 

A single stranded DNA molecule can be made into a DsDNA molecule during [[DNA replication]] in the cell, by [[DNA polymerase]]&nbsp;III.