DNA is incredibly important for humans. Its how our off springs look similar to us; it allows for us to be related. DNA is in fact a nucleotide, two nucleotides spiral together to create DNA double helix. Nucleotides are very important types of biological molecules and they are incredibly complex, but luckily there structure can be explained in a (relatively) understandable fashion. DNA nucleotides have a pentose sugar which is called deoxyribose (DNA stands for deoxyribonucleic acid). In your body every single DNA nucleotide has the same sugar and a phosphate group. However the base on each nucleotide can vary; there are 4 possible bases. Adenine (A), thymine (T), cytosine (C) and guanine (G). There are two types of bases in which all four them belong. Purine bases are larger as they contain two carbon-nitrogen rings; the two Purine bases are Adenine and Guanine.
Pyrimidines are the other type of base that there is. Pyrimidines are smaller than Purine as they have one carbon-nitrogen ring. Cytosine and Thymine are pyrimidines and it is easy to remember that is Pyrimidines bases have a Y in them. A molecule of DNA contains two polynucleotide chains - of which each chain is made up of lots of nucleotides joined together.
RNA is another nucleotide which is as important as DNA is, but we all know that DNA gets the spotlight because of Jurassic Park. Ribonucleic acid contains nucleotides with a ribose sugar. The similarities are that RNA has a phosphate group and one of four different bases. In RNA there is no thymine rather Uracil replaces it. Uracil is a pyrimidine. An RNA molecule is made up of a single polynucleotide chain, whereas DNA is made up of two polynucleotide chains. RNA is incredibly important as it allows proteins to be created, without RNA we would die very quickly as our bodies would not be able to metabolise, and cells would not be able to do anything at all.
RNA and DNA seem similar when pronounced but upon further research you can see the difference they have and both have an important role in the body and allow it to function the way it does. The subtle changes make a big difference in how they behave.