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.
Chemical reactions are routinely completed in labs and occur as natural processes in the environment. Many chemical reactions absorb or release heat and energy as part of their process. An exothermic reaction is any reaction that releases or gives off energy during the reaction.This means that the reaction gives out energy to its surroundings.any chemical reactions absorb or release heat and energy as part of their process. An exothermic reaction is any reaction that releases or gives off energy during the reaction.