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.
What is necessary for a decomposition reaction to occur? A decomposition reaction needs the addition of a catalyst or heat to proceed. For instance hydrogen peroxide will break down into water and oxygen gas in the presence of a cat â¦ alyst; and calcium carbonate will break down into calcium oxide and carbon dioxide gas when heated.