As you will be aware the gene is the basic unit of biological information. Most genes code for a protein product: the gene is transcribed to RNA and this RNA messenger is then translated to the protein product. In addition to genes which encode proteins, there are many genes which encode stable RNAs such as ribosomal RNA and transfer RNA. The number of genes contained within the genome of an organism ranges from around 500 for the bacterium Mycoplasma genitalium to over 50,000, predicted to be present in most plants.