Coursework.Info - Inspiration in an Instant

On the left is an image preview of every page of this document, and below are the first 150 words with formatting removed:

An Account of Proteins and their Structure It is difficult to describe in a simple sentence the role of proteins. Let's say: When there is something to do, it is a protein that does it. Some examples of proteins * Antibodies: they recognize molecules of invading organisms. * Receptors: part of the cell membrane, they recognize other proteins, or chemicals, and inform the cell. * Enzymes: assemble or digest. The role (or function) of a protein depends on its shape, and chemical formula. Proteins play a number of vital roles in all organisms. Unlike carbohydrates and lipids they always contain nitrogen as well as carbon, hydrogen and oxygen. Sulphur is often present. The building blocks of the proteins are amino acids. Proteins are made of a long chain of amino acids, sometimes modified by the addition of sugars and phosphates. Amino acids unite to form proteins in much the same manner the monosaccharides combine...

To see the full version of this document, and 144,847 others