Describe the structure of a protein.

Proteins are large biomolecules which play a key role in many of the body's proccesses. Their structure can be broken down into 4 main domains. The primary structure consists of a unique sequence of amino acids. The secondary structure is the initial folding of the sequence resulting in the formation of alpha helixes and beta pleated sheets. These are the names given to the hydrogen bonds that form between the amino acids. The tertiary structure involves the further folding of the protein into a 3D globular shape. This results in more hydrogen bonds as well as other bonds such as di-sulfide bridges. And finally, some, but not all, proteins may take on a quarternary structure. This is where 2 or more proteins combine together to form 1 larger protein. An example of this would be haemoglobin which consists of 4 protein rings.