And it takes up about 25% of space found inside that nucleus. Now, this is a very important section because within this section we have RNA molecules and proteins that are responsible for synthesizing our RNA or ribosomal RNA that is needed to create ribosomes found within the endoplasmic reticulum as well as inside our cytosol of the cell. Finally, let's discuss the composition of DNA inside the nucleus. So earlier we said the entire purpose of the nucleus is to store, protect and express our genetic information, the DNA, the deoxyribonucleic acid. Now, the problem is the linear version of DNA is extremely long. In fact, if we take a single DNA molecule found inside the human cell and we extend it in a linear fashion, it will be over 5ft long and that's extremely long.