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What is the difference between a hormone and an enzyme?

These substances are both proteins, they are coded for by DNA. They both fit together with their target by a lock and key fit, in other words their form or shape is very important to the way they function and mutation in the DNA can affect that shape. But hormones are informational molecules, inother words they travel through the blood to signal distant parts of the body to do something. Human growth hormone signals cell division and bone growth. It only works on cells that have the proper receptor or "docking station" on their surfaces. Enzymes are catalysts, they make chemical reactions go faster than they normally would so metabolism can take place at a useful rate.

Van Hoeck

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