OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Which of the following is true about enzymes?

  1. They are consumed in chemical reactions

  2. They can catalyze multiple reactions

  3. They operate at high temperatures only

  4. They do not affect reaction rates

The correct answer is: They can catalyze multiple reactions

Enzymes are biological catalysts that speed up chemical reactions without being consumed in the process. They can participate in numerous reactions, allowing them to facilitate the same type of reaction multiple times. This ability to act repeatedly makes enzymes essential for various biochemical processes in living organisms. Considering the other statements, enzymes are not consumed during reactions, which means they can continue to catalyze subsequent reactions after the first. They also do not operate exclusively at high temperatures; instead, each enzyme has an optimal temperature and pH range that allows it to function effectively. Lastly, enzymes are critical in influencing reaction rates, dramatically increasing the speed at which reactions proceed, which is foundational to their role in metabolism and cellular function.

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