Both dna and rna nucleotides contain three basic components. nucleotides contain all of the components listed except

Sugar - Either ribose or deoxyribose (in RNA or DNA)
Nitrogenous base - Adenine, guanine, cytosine, thymine (only in DNA), uracil (only in RNA)
Phosphates - One to three, two of which are usually hydrolyzed to provide the energy to attach the nucleotide and form the phosphodiester bond

Are you asking about a street map usage  if so here is your answer  a street map for a very limited area could simply be a bit map or a .jpg image.  but a more general map would probably store the streets as vectors.  but you shouldn't assume that there is one way to do it

The littoral zone. . .