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Which of the following statements about enzymes is correct?

1. Enzymes are highly specific biological catalysts that cannot be poisoned.
2. Enzymes are usually heterogeneous catalysts and act with very high specificity.
3. Enzymes are specific biological catalysts that can ordinarily work at extremely high temperatures (about 1000 K).
4. Enzymes are specific biological catalysts that have distinct, well-defined active sites.

Correct answer: Enzymes are specific biological catalysts that have distinct, well-defined active sites.

Solution

Enzymes function as biological catalysts by binding to specific substrates at their active sites, which are uniquely shaped to facilitate chemical reactions, ensuring high specificity in their action.

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