Final answer:
An endergonic reaction is a non-spontaneous reaction that requires energy and results in an increase in molecular order. The reverse reaction, called exergonic, releases energy and is spontaneous.
Step-by-step explanation:
A non-spontaneous reaction that results in an increase in molecular order and requires energy is called an endergonic reaction. In this type of reaction, the products have more free energy than the reactants, and the reaction will not occur on its own without an input of energy. The reverse reaction, which releases energy and is spontaneous, is called an exergonic reaction.
For example, the synthesis of glucose in metabolism is an anabolic process that involves endergonic reactions, as complex molecules like sugars are formed from simpler ones and require energy. On the other hand, the breakdown of glucose into simpler molecules in catabolic processes releases energy in exergonic reactions.