What is the relationship between anabolism and catabolism in metabolism?

Anabolism and catabolism are two complementary processes that play a crucial role in metabolism. Anabolism refers to the metabolic pathways that build complex molecules from simpler ones, requiring energy input to synthesize compounds like proteins, lipids, and nucleic acids. This process is essential for growth, repair, and the synthesis of cellular components.

Conversely, catabolism involves the breakdown of complex molecules into simpler ones, releasing energy that can be harnessed for various cellular functions. This process includes the digestion of food and the breakdown of cellular components to provide energy for anabolic reactions and other cellular activities.

Understanding the distinction between these processes is key to comprehending how organisms utilize nutrients and energy to sustain life. The correct option accurately describes that anabolism builds up while catabolism breaks down, highlighting their opposite yet interdependent roles in metabolism.