Anabolism Definition

Anabolism is a set of enzyme-catalyzed reactions that synthesize relatively complex molecules from simple structures in living systems.

• Anabolism is also called biosynthesis as it is involved in the formation of various compounds that are then used as cell components as well as energy.
• The process of anabolism requires energy; thus, it is an endergonic process, and the primary source of energy is solar energy.
• Anabolism is a part of metabolism where organic substances are formed so that they can be used later for energy.
• Reactions in anabolism occur in a step-by-step process so as to increase the organic content of the cell, which is essential for growth.
• In a non-growing cell, the process of anabolism is balanced by catabolism, but in growing cells, anabolic processes often dominate over catabolic reactions.
• The process of anabolism occurs in three distinct stages: In the first stage, monomers like monosaccharides and amino acids are formed. In the second stage, the monomers are activated by providing energy. In the final stage, the reactive monomers are assembled into complex molecules like polysaccharides and proteins.
• The overall process of anabolism differs in different groups of living beings. Autotrophs can synthesize complex molecules starting with single carbon precursors like carbon dioxide, but heterotrophs utilize the monomers from autotrophs to synthesize organic polymers.
• Anabolism is powered by catabolism where the energy obtained from catabolism is used for anabolism.
• The most important process in anabolism is polymerization, where monomeric units are linked together to form polymeric units.
• Anabolism is regulated by enzymes that undergo irreversible steps at some point in the pathways to ensure that biosynthesis doesn’t occur in an infinite loop.
• Anabolic processes include pathways like photosynthesis, amino acid biosynthesis, and gluconeogenesis which are essential for the built-up of organs and tissues and their differentiation.