Which figure demonstrated that enzymes play a role in metabolism, laying the groundwork for biochemistry?

• A. Eduard Buchner
• B. Linnaeus
• C. John Snow
• D. Florence Nightingale

Answer: (A)

Enzymes as catalysts for metabolism drive the modern view of how living systems work. Eduard Buchner demonstrated this with his cell-free fermentation experiments: he crushed yeast and prepared an extract that could convert sugar to ethanol and carbon dioxide even when no living yeast cells remained. This showed that a chemical substance within the extract—an enzyme—could catalyze metabolic reactions outside of intact cells. By proving that metabolism can occur with the help of these biological catalysts, Buchner laid the groundwork for biochemistry and enzymology, shifting thinking from a view that living processes required intact organisms to one that recognized specific enzymatic reactions as the engines of metabolism. He even coined the term zymase to describe the active enzymatic component responsible for fermentation. In contrast, the other historical figures are associated with different fields: one is known for classifying living things, another for tracing disease spread, and the last for improving nursing and hospital care. Their contributions are essential to science and medicine, but they do not illustrate the enzymatic control of metabolic processes that underpins biochemistry.