Anabolism is building up (synthesis) of molecules.

• A. Anabolism
• B. Catabolism
• C. Exergonic Reactions
• D. Metabolism

Answer: (A)

Anabolism refers to building up molecules through synthesis, using energy to assemble complex structures from simpler units. This is exactly what the statement describes, since it highlights synthesis and construction of larger molecules from smaller ones. In metabolism, anabolic processes are paired with catabolic ones, which break down molecules and often release energy. So, the idea of building up fits anabolic pathways, while catabolic processes break things down. Exergonic reactions release energy, which is not characteristic of the synthesis-focused, energy-using nature of anabolism, and metabolism is the entire collection of all chemical reactions, not just the building-up aspect.