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.
1 Heat energy causes some of the reactants to evaporate, increasing the concentration of the reactants. 2  Heat energy helps to lower the amount of overall energy that is required for the reaction to occur. 3  Heat energy increases the size of the molecules of reactants, and therefore the molecules react more frequently. Heat energy causes some of the reactants to evaporate, increasing the concentration of the reactants. 2  Heat energy helps to lower the amount of overall energy that is required for the reaction to occur. 3  Heat energy increases the size of the molecules of reactants, and therefore the molecules react more frequently.