The origin of replication (also called the replication origin) is a particular sequence in a genome at which replication is initiated.
It is the interaction of two or more substances, resulting in chemical changes in them. Chemical reactions take place when some kind of energy is supplied to them. The supplied energy may be in the form of heat, light or mechanical shaking for proper contact between the reactant molecules or electricity.
Spontaneous Combustion, Chemical Reactions and Fire. The results of chemical reactions that occur during spontaneous combustion are light and heat. Assuming a fuel is present, the heat is often enough to start a fire. Consider these examples: Spontaneous coal combustion: Coal can spontaneously combust if thereâs enough oxygen available and the heat produced by the coal is not dissipated fast enough. The vicious cycle causes thermal runaway and a fire starts.