Enzymes are protein molecules in cells that act as catalysts. Enzymes accelerate chemical reactions in the body but are not consumed.Almost all biochemical reactions in living things require enzymes. With an enzyme, chemical reactions are much faster than without the enzyme. p39The substances at the beginning of the reaction are called substrates. The substances at the end of the reaction are the products. Enzymes process the substrates and turn them into products.support language:de-DE = Deutsc
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