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.
An endothermic reaction needs heat in the reaction which is taken from the surroundings, thus making the temperature drop in the surroundings. 5 people found this useful. Edit. Share to: 1  Defining an Addition Reaction In mathematical terms, an addition is made by the process of increasing something.f a chemical reaction proceeds by releasing heat in the surroundings, than the reaction is an exothermic reaction and if it needs heat to proceed than it is an endothermic re â¦ action.