Proteins, from the Greek proteios, meaning first, are a class of organic compounds which are present in and vital to every living cell. In the form of skin, hair, callus, cartilage, muscles, tendons and ligaments, proteins hold together, protect, and provide structure to the body of a multi-celled organism. In the form of enzymes, hormones, antibodies, and globulins, they catalyze, regulate, and protect the body chemistry.
Definition of long division for Students. : division in arithmetic that involves several steps that are written out.
Consult your textbook for more details and examples. 1  Find the longest continuous chain of carbon atoms. This longest chain may not be written in a straight line. 2  Name that longest chain with the appropriate alkane name. 3  Find the substituents and name each of them with the appropriate group name.