Enzyme Action - PHSchool.com Animation: How Enzymes Work (See related pages) View the animation below, then complete the quiz to test your knowledge of the concept. 1: Enzymes are; A) lipids. B) enzyme, biological catalyst catalyst, substance that can cause a change in the rate of a chemical reaction without itself being consumed in the reaction; the changing. en·zyme (ĕn′zīm) n. Any of numerous compounds that are produced by living organisms and function as biochemical catalysts. Some enzymes are simple proteins, and. enzyme. Enzymatic Action. Like all catalysts, enzymes accelerate the rates of reactions while experiencing no permanent chemical modification as a result of their. enzyme, biological catalyst catalyst, substance that can cause a change in the rate of a chemical reaction without itself being consumed in the reaction; the changing. Enzymes are not rigid, static structures; instead they have complex internal dynamic motions – that is, movements of parts of the enzyme's structure such as. Enzyme catalysis is the increase in the rate of a. where the muscle force derives from an integrated action of active streaming. Enzyme catalysis; Enzyme. Factors Affecting Enzyme Action The activity of enzymes is strongly affected by changes in pH and temperature. Each enzyme works best at a certain pH. enzyme [en´zīm] any protein that acts as a catalyst, increasing the rate at which a chemical reaction occurs. The human body probably contains about 10,000.