Kaplan Nursing Entrance Exam Practice 2025 – Comprehensive Prep

Enzymes serve as biological catalysts, meaning they accelerate chemical reactions without being consumed or permanently altered in the process. They are primarily made of proteins, and their activity is highly dependent on environmental conditions, such as pH and temperature, at which they operate most effectively.

The correct response identifies the misconception that enzymes are destroyed during chemical reactions. In actuality, enzymes facilitate reactions and can be reused multiple times. While they may undergo temporary changes during a reaction, they revert to their original state afterward, allowing them to continue catalyzing subsequent reactions. This is fundamental to their role in biological systems, where efficiency and sustainability are crucial.

The other statements correctly highlight essential aspects of enzyme functionality; they are indeed catalysts, with the vast majority being proteins, and they operate within specific optimum pH ranges for maximum activity. Understanding these principles is vital for recognizing the role of enzymes in biochemical processes.