National League for Nursing (NLN PAX) Practice Exam

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Which of the following is the primary role of enzymes in biochemical reactions?

To slow down reactions
To act as substrates
To catalyze reactions
To become consumed in reactions

The correct answer is: To catalyze reactions

Enzymes play a crucial role in biochemical reactions primarily by acting as catalysts. This means they help to accelerate the rate of reactions without being consumed in the process. Enzymes lower the activation energy required for reactions to occur, which allows metabolic processes to happen more efficiently and at a faster rate. Their catalytic function also allows biological systems to operate under milder conditions, such as lower temperatures and pressures, which are vital for the survival of living organisms. Since enzymes remain unchanged after facilitating a reaction, they can participate in multiple reaction cycles, enhancing their overall effectiveness. The other options do not accurately describe the primary function of enzymes. While it’s true that they do not slow down reactions or act as substrates, and they are not consumed in reactions, these points further emphasize the unique role they play in facilitating and speeding up biological processes.