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.
1. measuring a great distance from one end to the other. a long journey; a long road; long legs. 2. having a great period of time from the first moment to the last. The book took a long time to read; a long conversation; a long delay. 3. measuring a certain amount in distance or time. The wire is two centimetres long; The television programme was just over an hour long.