0845 numbers, for example, are free to call for up to an hour, during the inclusive minutes of your call package if you're a BT customer. Yet call an 0844 number and you'll be charged up to 5.1p/minute, plus a connection fee of up to 15p.
The resulting mRNA is a single-stranded copy of the gene, which next must be translated into a protein molecule. During translation, which is the second major step in gene expression, the mRNA is read according to the genetic code, which relates the DNA sequence to the amino acid sequence in proteins (Figure 2).
Translation is the first step in the system by which cells build proteins. It is part of the overall procedure that allows the expression of genes contained in the DNA and is critical for the continuation of cellular life. The entire process is made possible by an extremely small cellular organelle known as the ribosome.