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.
When chemical bonds are formed, heat is released in an exothermic reaction. There is a loss of kinetic energy in the reacting electrons, and this causes energy to be released in the form of light. This light is equal in energy to the stabilization energy required for the chemical reaction (the bond energy).