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Strand direction  Torsional angles

Terminology  DNA is a polymer made up of repeated units, nucleotides, comprising three components:  a sugar (2'-deoxyribose), phosphate and one of four heretocyclic bases.  The bases are:  adenine (A), thymine (T), guanine (G), cytosine (C).  The term nucleoside stands for base + sugar (without phosphate).  The names of the nucleosides are:  adenosine (A), thymidine (T), guanosine (G), cytidine (C).  or more precisely deoxyadenosine, .....  Individual nucleotides (not in DNA) are often called deoxyadenosine-5'-phosphate, for example, or like the well-known dATP deoxyadenosine-5'-triphosphate.  A terminology of nucleotides as parts of DNA is deoxythymidylate, ...... .  However, it is common practice to adopt the nucleoside names given above for the nucleotides as well. This is done, for example, in the Protein Data Bank format description (PDF format).