What is an example of anabolism?

The correct answer highlights the concept of anabolism, which refers to the metabolic processes that build complex molecules from simpler ones, requiring energy. Protein synthesis in muscles is a prime example of an anabolic process. During this process, individual amino acids are assembled into polypeptides and proteins, which are essential for muscle growth, repair, and overall function. This synthesis requires energy, specifically in the form of ATP, and is critical for the maintenance and development of muscle tissue.

In contrast, the other options represent catabolic processes or different metabolic functions. For instance, burning fat for energy involves breaking down fatty acids to release energy, while digestion of carbohydrates refers to the breakdown of complex carbohydrates into simple sugars. Lastly, the conversion of glucose to energy typically describes glycolysis, a catabolic pathway where glucose is broken down to produce ATP. Thus, these activities do not exemplify anabolism, which specifically focuses on the synthesis and construction of larger biological molecules.