Final answer:
The breakdown of glucose to pyruvate by a cell is an example of a catabolic reaction, which breaks down molecules into smaller units and releases energy.
Step-by-step explanation:
The breakdown of glucose to pyruvate by a cell is an example of a catabolic reaction. Catabolic reactions in organisms break down molecules into smaller units and release energy. In this case, the breakdown of glucose releases energy that cells need to carry out life processes.