(Science: biochemistry) a protein molecule produced by living organisms that catalyses chemical reactions of other substances without itself being destroyed upon completion of the reactions. They are also called organic catalyst. enzymes do change their shape during reaction but the shape is restored to “Pre-reaction\” state upon completion of your reaction.
Enzymes are classified according to the recommendations of the nomenclature Committee of the international union of biochemistry. Each enzyme is assigned a recommended name and an enzyme Commission (EC) number. They are divided into six main groups, oxidoreductases, transferases, hydrolases, lyases, isomerases and ligases.
Enzymes are any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions. enzymes have to operate in certain environment conditions (such as at thirty seven degrees celsius in humans) to operate optimally. there are factors, such a change in temperature or the absence of a co-enzyme that reduce the effectiveness of an enzymes reaction.
Long story short, enzymes speed up chemical reactions. however, substrates, the reactants that change inside the enzyme, must fit like a lock and key: only certain amounts and kinds of substrates fit inside an enzyme. factors such as high temperature and ph not in the optimal range can change the shape of the enzyme and, consequently, the substrate(s) will not fit. This is why extremely high and low temperatures and high and low phs can be dangerous to organisms.