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.
Best Answer: An exothermic reaction gives off heat, as oppose to an endothermic reaction, which takes in heat. If you put in heat to make the reaction happen, then it is endothermic. If the reaction makes the surroundings hotter, then it is exothermic. E.g. melting ice requires heat, so it is endothermic.