Final answer:
An exergonic reaction releases energy, such as the combustion of methane during cellular respiration, while an endergonic reaction requires energy to proceed, like photosynthesis.
Step-by-step explanation:
An example of an exergonic reaction is the combustion of methane, which is a catabolic process. This reaction releases energy, making it spontaneous, and it occurs during cellular respiration, where glucose is broken down to release energy that cells require for various functions. An example of an endergonic reaction would be photosynthesis, an anabolic process that requires energy to synthesize glucose from carbon dioxide and water. Endergonic reactions in biology often pertain to the building of complex molecules from simpler ones and are non-spontaneous, meaning they will not occur without an input of energy.
Other examples highlighted in your course material include:
- Endergonic process - A chick developing from a fertilized egg, which requires energy.
- Exergonic process - A compost pile decomposing, which releases energy as it breaks down organic material.