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What does ABC stand for?

ABC stands for Acid and Base Catalysis

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This model of enzyme catalysis in also called the Lock and Key model. Enzyme catalysis can be explained by using the steady state theory. In enzyme catalysis, an enzyme provides a catalytic surface to reactant molecules and forms a transition state. Since the enzyme catalysis follows a steady state concept, the production and consumption of the transition state proceed at the same rate and the concentration of transition state stays constant. Mechanism of Catalysis Back to Top Acid- base catalysis.
Fortunately, these retarding factors can often be overcome by acid or base catalysis, which in general enhances electrophilicity (acids) or nucleophilicity (bases). Equations 7 through 9 show how this tactic may be effectively applied to the unreactive examples given above.
Acid–base catalysis, acceleration of a chemical reaction by the addition of an acid or a base, the acid or base itself not being consumed in the reaction. The catalytic reaction may be acid-specific (acid catalysis), as in the case of decomposition of the sugar sucrose into glucose and fructose in sulfuric acid; or base-specific (base catalysis), as in the addition of hydrogen cyanide to aldehydes and ketones in the presence of sodium hydroxide.