It is energetically favorable.Group of answer choicesenergy couplingendergonic reactionspontaneous processmetabolism

To determine which answer choice is energetically favorable, let’s analyze each option with respect to their meanings in the context of energy dynamics in biological and physical systems.

1. Energy Coupling: This refers to the process where the energy released from an exergonic reaction (which releases energy) is used to drive an endergonic reaction (which requires energy). This process is indeed energetically favorable as it allows cells to effectively utilize available energy.

2. Endergonic Reaction: An endergonic reaction is one that requires energy input to proceed, making it not energetically favorable on its own without coupling to an exergonic reaction.

3. Spontaneous Process: This term describes a reaction that occurs without requiring additional energy input once initiated. Spontaneous processes are generally associated with exergonic reactions and are energetically favorable.

4. Metabolism: Metabolism encompasses all chemical reactions in a biological system, including both energy-releasing (catabolic) and energy-consuming (anabolic) reactions.

Conclusion

The most appropriate answer for what is "energetically favorable" would be spontaneous process because these are reactions or processes that favorably occur without additional energy input. However, energy coupling can also be considered energetically favorable in the context of biological systems that utilize the favorable release of energy to drive less favorable reactions. Thus, both "spontaneous process" and "energy coupling" have merit, but the best singular choice is:

Final Answer

Spontaneous process