DO YOU KNOW ?  DNA stands for DeoxyriboNucleic Acid. It is the genetic material of a cell. The chromosomes inside the nucleus (control centre) of the cell are made of DNA. Lots and lots of DNA. It is very fine and tightly coiled but there may be as much as a metre in a single cell. DNA is really a code. It is divided up into sections. Dr Matthew Hodgkin, a Research Fellow at Birmingham University's Institute of Cancer Studies explains "DNA is divided into functional units. These functional units are genes which carry all the instructions for making up our body. So there is a gene that tells the body to have brown hair and so on. Each gene is a code for a particular protein. Our bodies are made up of proteins. So the genes dictate how we are made and what our bodies look like. You may have heard the term 'double helix'. This describes the DNA molecule. It is two strands coiled round each other. You inherit half your DNA from your mother and half from your father. The genes are all in pairs and which of each pair you inherit from each parent is randomly determined when the egg or sperm cells are developing. This explains why an inherited disease caused by one gene will only be passed on to children in 50% of cases." (from:cancerhelp.org.uk).

What does RNA do in cells?
RNA serves a multitude of roles in living cells. These include: serving as a temporary copy of genes that is used as a template for protein synthesis (mRNA), functioning as adaptor molecules that decode the genetic code (tRNA) and catalyzing the synthesis of proteins (rRNA). There is much evidence implicating RNA structure in biological regulation and catalysis. Interestingly, RNA is the only biological polymer that serves as both a catalyst (like proteins) and as information storage (like DNA). For this reason, it has be postulated RNA, or an RNA-like molecule, was the basis of life early in evolution.(from: rnabase.org)
Site-specific gene manipulation of fluorescent proteins using artificial restriction DNA cutter.Katada H, Ren Y, Shigi N, Komiyama M. Research Center for Advanced Science and Technology, The University of Tokyo, Meguro, Tokyo 153-8904, Japan.
Two of three amino acid residues, which compose the chromophore of the enhanced green fluorescent protein (EGFP), were converted to others by using artificial restriction DNA cutter (ARCUT). The vector prepared by ARCUT was easily connected with the insert by using oligonucleotide additive and resultant fluorescent protein such as blue fluorescent protein (BFP) was successfully expressed in cells.
bron:pubmed.org