What are nucleotides used for?
Nucleotides are used for DNA and RNA. DNA is information needed so that they are able to align themselves. Also, this is what keeps all the organisms in your body to remain alive.
DNA nucleotides 'code' for RNA copies of the DNA strand, but the true 'coding' of nucleotides happen in the ribosome where amino acids are matched to the RNA nucleotides. Nucleotides in DNA are only are present to store genetic data. When a particular gene needs to be used or a protein needs to be made, a RNA copy of the DNA will be made, using the slightly different RNA nucleotides (adenine, uracil, cytosine and guanine)…
The nucleotides used to build DNA are Adenine, Cytosine, Guanine, and Thymine. For RNA, there is no Thymine; it is replaced with another nucleotide called Uracil. These are actually the names of the nitrogenous bases that nucleotides contain. A nucleotide is made up of a Deoxyribose Sugar, a Phosphate Molecule, and a Nitrogenous Base. We refer to them though by the name of their nitrogenous base.
There are molecules like ATP which contains nucleotides, called nucleoside triphosphates. These molecules are nucleotides with two extra phosphates (total of three because of the phosphate group on a nucleotide) which give the molecule energy. Energy is needed during DNA replication when new nucleotides are forming on the old strand in the replication bubble.