: These precursors are activated into reactive forms, a step fueled by the consumption of ATP.
: The body identifies or generates building blocks, such as amino acids or isoprenoids. anabolism
Anabolism is fundamental to nearly every form of life, occurring simultaneously with catabolism to maintain cellular health. : These precursors are activated into reactive forms,
: The activated monomers are polymerized and assembled into complex macromolecules like proteins, lipids, and DNA. Critical Biological Examples : The activated monomers are polymerized and assembled
is the "building up" phase of metabolism, consisting of biosynthetic pathways that construct complex macromolecules from smaller, simpler units. This process is endergonic , meaning it requires an input of energy (typically ATP) and reducing power (often NADPH) to proceed. It is essential for growth, tissue repair, and energy storage, acting as the constructive counterpart to catabolism. Core Mechanism and Stages
Anabolic reactions transform simple precursors like amino acids, monosaccharides, and nucleotides into complex structures through three primary stages: