Enzymes :: Free Essays

Enzymes are proteins, cool of polypeptide chains and non-protein groups. Their function is to protagonist with the reactions of many cells and molecules by serving as catalysts. A catalyst is a substance that allows the activation energy need for a reaction by forming a temporary association with the molecules that are reacting. During this process, the catalyst itself is not for good altered in the process, and so it tail assembly be used over and over again. Because of catalysts, cells are able to draw out out chemical reactions at a great speed and at comparative low temperatures. close to 2,000 different enzymes are now cognize, distributively of them capable of catalyzing a precise chemical reaction. The molecule (s) on which an enzyme acts is known as its substrate. For example, sucrose is the substrate for the enzyme sucrase. Enzymes have particular proposition structures that only its specific substrate will outfit into. The polypeptide chains of an enzyme are folded in much(prenominal) way that they form a grove or pocket on the surface. The substrate fits in to this grove, which is the target of reactions catalyzed by the enzyme, or combat-ready point. upstart studies of enzyme structure have suggested that the prompt site is flexible. The binding between enzymes and substrate appears to alter the shape of the enzyme. This induces a close fit between the active site and the substrate. It is also believed that this whitethorn put some strain on the substrate molecule facilitating the reaction. some other characteristics of enzymes are competitive inhibition and non-competitive inhibition. competitory inhibition is the binding of a competitive molecule to the active site of the enzyme. This prevents the worthy substrate from reacting with the enzyme. In non-competitive inhibition the binding of a non-competitive inhibitor to other site on the enzyme induces an allosteric change, or conformational change, that prevents the active site from binding to the proper substrate.Enzymes Free Essays Enzymes are proteins, composed of polypeptide chains and non-protein groups. Their function is to help with the reactions of many cells and molecules by serving as catalysts. A catalyst is a substance that allows the activation energy required for a reaction by forming a temporary association with the molecules that are reacting. During this process, the catalyst itself is not permanently altered in the process, and so it can be used over and over again. Because of catalysts, cells are able to carry out chemical reactions at a great speed and at comparative low temperatures.Almost 2,000 different enzymes are now known, each of them capable of catalyzing a specific chemical reaction. The molecule (s) on which an enzyme acts is known as its substrate. For example, sucrose is the substrate for the enzyme sucrase. Enzymes have specific structures that only its specific substrate will fit into. The polypeptide chains of an e nzyme are folded in such way that they form a grove or pocket on the surface. The substrate fits in to this grove, which is the site of reactions catalyzed by the enzyme, or active site. Recent studies of enzyme structure have suggested that the active site is flexible. The binding between enzymes and substrate appears to alter the shape of the enzyme. This induces a close fit between the active site and the substrate. It is also believed that this may put some strain on the substrate molecule facilitating the reaction.Another characteristics of enzymes are competitive inhibition and non-competitive inhibition. Competitive inhibition is the binding of a competitive molecule to the active site of the enzyme. This prevents the proper substrate from reacting with the enzyme. In non-competitive inhibition the binding of a non-competitive inhibitor to another site on the enzyme induces an allosteric change, or conformational change, that prevents the active site from binding to the prope r substrate.