Question

Which of the following reactions is endergonic?
A. $ATP~\to ~ADP\text{ }+\text{ }{{P}_{i}}$
B. $NADH~\to ~~~NA{{D}^{+}}^{{}}{{+}^{{}}}{{H}^{+}}~~$
C. $~(CH2~O)n+O2\to CO2+H2O$
D. None of the above

Answer 1

Endergonic reaction is a type of non-spontaneous reaction in which to move the reaction forward, energy needs to be supplied externally. The collapse of bonds often releases energy and is exothermic in nature.

Complete answer: An endergonic reaction in chemical thermodynamics, that is often described as a heat absorbent non-spontaneous reaction or an unfavorable reaction. It is a chemical reaction wherein the normal shift in free energy is positive and in order to conduct this reaction it needs an additional driving force or external energy. In other words, it is a type of reaction that needs more energy than what is obtained from it to start the reaction. This implies that there is a negative cumulative sum of useful energy, so the total energy is a negative net product. In this reaction, for the reaction to occur, energy must also be absorbed from the atmosphere into the functional device. The improvement in standard Gibbs free energy will be optimistic at the standard state, at constant temperature and constant pressure conditions. An endergonic reaction is anabolic in metabolism, meaning energy is retained. Energy is supplied in many such anabolic processes by coupling the reaction to ATP or adenosine triphosphate, leading to high energy. A breakdown takes place according to the three choices. If it is sugar or fat or ATP, the reactions take place by the breakdown. We know that energy is often released when a bond in a compound is broken. The breakdown reactions are, thus, exothermic reactions. Exergonic reactions are the breakdown of ATP, NADH, and carbohydrate reactions.
Hence, the correct option is option D- None of the above.

Note: Exothermic reaction is a type of reaction or processes which, typically in the form of heat or light, release energy. Energy is released in an exothermic reaction when the total energy of the components is below the total energy of the reactants. Endothermic reactions are reactions that use external energy for the reaction to proceed, typically in the form of heat. They usually cause their environments to cool down because endothermic reactions draw heat from their environments.