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A chain reaction is a sequence of reactions where a reactive product or by-product causes additional reactions to take place. In a chain reaction, positive feedback leads to a self-amplifying chain of events.
La reacción en cadena de la polimerasa, o PCR, es una técnica para hacer muchas copias de una determinada región de ADN in vitro (en un tubo de ensayo en lugar de un organismo). La PCR depende de una ADN polimerasa termoestable, la Taq polimerasa, y requiere de cebadores de ADN diseñados específicamente para la región de ADN de interés.
A chemical chain reaction proceeds by a sequence generally subdivided into three stages: (1) Initiation, in which a reactive intermediate, which may be an atom, an ion, or a neutral molecular fragment, is formed, usually through the action of an agent such as light, heat, or a catalyst.
- The Editors of Encyclopaedia Britannica
Explosions, polymerizations, and food spoilage often involve chain reactions. The chain reaction mechanism is involved in nuclear reactors; in this case the chain carriers are neutrons. The mechanisms describing chain reactions are useful models for describing chemical reactions.
Define a chain reaction, and list some of the different kinds of steps such a reaction will involve. Define a branching chain reaction, and explain how such reactions can lead to explosions.