The primary function of enzymes in a biological context is to act as catalysts that accelerate chemical reactions within living organisms. They lower the activation energy required for reactions to occur, making it easier for biological processes to happen efficiently and under normal physiological conditions. Enzymes are highly specific, meaning each enzyme catalyzes a particular reaction or type of reaction. They play critical roles in various bodily functions, including metabolism, digestion, and DNA replication, ensuring that life-sustaining reactions occur in a timely manner.