Question 19

Enzymes catalyze reactions.

Enzymes are biological catalysts that speed up chemical reactions in the body without being consumed in the process. They lower the activation energy required for reactions to occur, facilitating the conversion of substrates into products.

A) Catalyze

This option is correct because enzymes indeed catalyze reactions. They are essential for various biochemical processes, including digestion and metabolism, by increasing the rate of reactions that would otherwise occur too slowly to sustain life.

B) Inhibit

This option is incorrect. While some substances can inhibit enzyme activity, enzymes themselves do not inhibit reactions; rather, they facilitate and accelerate them. Inhibition refers to the decrease in the rate of an enzymatic reaction, which is not a function of enzymes themselves.

C) Stop

This option is incorrect. Enzymes do not stop reactions; they promote them. When enzymes are present, they allow reactions to occur more efficiently, rather than halting or preventing them.

D) None of the above

This option is also incorrect. Since enzymes do catalyze reactions, stating "none of the above" is misleading. This choice implies that enzymes do not perform any of the listed actions, which contradicts the fundamental understanding of enzyme function.

Conclusion

The correct answer, "A) Catalyze," accurately reflects the fundamental role of enzymes in biochemical reactions. Options B, C, and D fail to recognize the primary function of enzymes as facilitators of reaction rates, thus confirming that they do indeed catalyze reactions.