Substance that accelerates a chemical reaction without affecting the properties of the materials involved.
A substance that speeds up a reaction without undergoing any permanent chemical change.
Any substance (entity), either of protein or of nonproteinaceous nature, that increases the rate of a chemical reaction, without being consumed itself in the reaction. In the bio-sciences, the term “enzyme” is used for a proteinaceous catalyst. Enzymes catalyze biological reactions.
Any substance that speeds up a chemical reaction without changing its own chemical structure.
A substance which produces or helps a chemical reaction without itself changing.
A substance, usually a protein, in living (or nonliving) systems that enhances or promotes a chemical reaction without being a reactant. Enzymes are catalysts.
A catalyst is a substance, such as an enzyme, that promotes in a chemical reaction but is not a reactant or a portion of the product.
Chemical (e.g., an enzyme) that speeds up the rate of a chemical reaction but is itself not permanently changed in the process.
A substance that promotes or speeds up a chemical reaction but is not changed in the process.
A substance that alters the rate of a chemical reaction but is itself unchanged at the end of the reaction. The catalysts of biochemical reactions are the enzymes.
A substance that speeds the rate of a chemical reaction without being permanently altered in the reaction. Catalysts are effective in small quantities and are not used up in the reaction (i.e., they can be recovered unchanged). All enzymes are catalysts; the human body has thousands of enzymes, each specific for a particular reaction. For example, pepsin catalyzes the hydrolysis of protein; amylase catalyzes the hydrolysis of starch; transaminases catalyze the transfer of an amino group from one molecule to another.
A substance possessing the remarkable ability to modify the pace at which a chemical reaction unfolds, all while remaining unaffected by any discernible physical or chemical transformation and without incorporating itself into the resulting product.
A catalyst is a substance that alters the rate of a chemical reaction without undergoing any physical changes itself. It facilitates the reaction by lowering the activation energy required for the reaction to occur, but remains unchanged throughout the process.
A substance, such as an enzyme, that increases the rate of a chemical reaction without being permanently changed itself by that reaction.