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.
For example combustion is an exothermic reaction in which energy is released in the form of heat. Unlike exothermic reaction, in an endothermic reaction the energy is absorbed in the form of heat.Letâs discuss some other aspects of endothermic reactions with appropriate examples.Chemical reactions that require heat energy are called endothermic reactions.. They become cooler as they progress.or example combustion is an exothermic reaction in which energy is released in the form of heat. Unlike exothermic reaction, in an endothermic reaction the energy is absorbed in the form of heat.