What defines bulk elements in living organisms?

Bulk elements in living organisms are defined as those that are present in large amounts and play essential roles in biological processes. These elements include carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur, which are the primary building blocks of biomolecules such as proteins, nucleic acids, carbohydrates, and lipids. Their abundance allows them to be integral to the structure and function of cells, as they provide the necessary framework for biochemical reactions and cellular processes, including metabolism and energy production.

The concept of bulk elements highlights their significance in the overall composition of living organisms compared to trace elements, which are only needed in minuscule quantities but still play crucial roles in various biological functions. Understanding the distinction helps in grasping how the biochemical foundation of life is constructed and sustained.