Final answer:
Biomolecules, particularly enzymes, function within narrow pH ranges, hence the body employs buffers to maintain pH stability vital for cellular activities.
Step-by-step explanation:
The pH of a solution is integral to the functioning of biomolecules because it influences the concentration of hydrogen ions, which in turn affects the structure and activity of proteins, including enzymes. Most biological processes occur within a narrow pH range, usually between pH 6.0 to 8.0, with notable exceptions like gastric juice. The body maintains pH balance through buffers such as the carbonic acid/hydrogen carbonate system in the blood, which helps to sustain a vital pH range of approximately 7.35 to 7.45. Outside this range, enzyme activity can decrease, leading to disrupted cellular functions and potential health issues. Within cells, different compartments can maintain different pH levels to fulfill specific roles.