What does the term "biochemical" refer to in the context of living organisms?

The term "biochemical" in the context of living organisms relates directly to the chemical reactions that occur within cells or tissues. Biochemical processes encompass the myriad of reactions that are fundamental to life, including metabolic pathways responsible for energy production, synthesis of biomolecules, and the regulation of physiological functions. These processes are crucial as they involve interactions of organic compounds and are typically mediated by enzymes, which are proteins that catalyze these reactions.

Understanding that biochemistry specifically refers to the chemical activity that occurs within living organisms distinguishes it from other types of chemical reactions that may happen externally or outside biological systems. This conceptual clarity is essential when studying aquatic ecosystems, as biochemical processes are involved in nutrient cycling, decomposition, and interactions between organisms in their environment. Therefore, the focus on internal cellular reactions aligns perfectly with the definition of biochemistry.