Acer executives promote the company's new BYOC strategy. Acer CEO Jason Chen is on far left. Acer Chairman Stan Shih is second to the left. Although the new cloud apps are free, the company wants to include extra features users can choose to pay for.
All proteins are made up of combinations of 20 different amino acids. The RNA code (like DNA) is written in just four different chemical 'letters' - bases. How can a code with four letters identify 20 different amino acids? By reading it three letters at a time - CAU, CAG, GGA, etc.
proteins are made of a chain of 20 different types of amino acid molecules this chain folds up into a compact shape rather like an untidy ball of string the shape of the protein is determined by the sequence of amino acids along its chain and it is this shape that in turn determines what the protein does