Doctor Thomas Nuhse explains that enzymes are proteins in a cell that perform the cell's chemistry.

Enzymes are basically a group of proteins that do chemistry in the cell. That means that they can either construct materials, they put two molecules together to build something useful. For example, all the material that our cells are made of are essentially made by enzymes. Some enzymes are responsible for degrading stuff - so the food that we eat is broken down into smaller units that our cells can use, and that again is something that is done by enzymes.

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