Molecular biology deals with deciphering biology at a molecular level. This branch of biology concentrates on comprehending the interrelationship between DNA, RNA and protein synthesis, regulation, modification and interaction. In other words, this subject is concerned with understanding the flow of information through the cell. The eukaryotic DNA, located within the nucleus, contains genetic information. Specific sites (genes) on this DNA are transcribed into pre-mRNA which are ultimately processed into messenger RNAs (mRNAs) before being transported out of the nucleus into the cytoplasm. Once in the cytoplasm, ribosomes, consisting of protein components and ribosomal RNAs (rRNAs), with the assistance of transfer RNAs (tRNAs) translate the mRNA into polypeptides which fold in specific conformation to form proteins. This concept of the flow of genetic information from DNA to the functional product protein via transcription and translation process is referred to as Central Dogma. The synthesized proteins are in return involved in DNA replication, RNA production, translation and transcription. Hence, the relationship between DNA, RNA and protein is inarguably mutually dependent.