Gene expression can be described as the conversion of information from genes into messenger RNA through transcription. Transcription takes place in the nucleus and this is where RNA copies of DNA are produced. This process is facilitated by RNA polymerase, where an RNA nucleotide is added to an RNA strand. RNA polymerase is an enzyme used to produce transcribed RNA. It is responsible for the construction of RNA chains, according to the process previously described under the name of transcription. RNA polymerase polymerizes ribonucleotides and the 3' end of the RNA transcript. It is essential to life and is found in all organisms. Additionally, it unwinds the DNA molecule, using it as a template, before synthesizing the corresponding mRNA strands. mRNA, or messenger RNA, is one of a large group of RNA molecules that communicate information from DNA to ribosomes. mRNA contains adenine, uracil, guanine and cytosine. Alternative to DNA that contains thymine instead of uracil. Ribosomes are part of a larger molecular group and are the central location where transcription occurs. These ribosomes are responsible for binding together...