Question detail

Which of the following best describes enzymes?

Try the question, check the answer, then read the explanation to understand the curriculum point.

Show answer Topic hub Objective page

At a glance

MCQ

Type

practice

Style

Topic

Rate of reaction

Question

A. Inorganiccatalysts that speed up reactions
B. Biological catalysts that are not used up in reactions
C. Substances that slow down chemical reactions
D. catalysts that are always included in chemical equations

Answer

Biological catalysts that are not used up in reactions

Explanation

The correct answer is Biological catalysts that are not used up in reactions. This answer directly addresses the question: Which of the following best describes enzymes? It matches the approved Chemistry 8462 learning objective and the linked subtopic. The other options are incorrect because they either change the rate, catalyst, reversible reaction, equilibrium, or graph context, or they do not answer the exact point being tested.

Common mistake

Misunderstanding catalyst usage

Students think a catalyst is consumed during the reaction and therefore must be added in excess

Explain that a catalyst is not used up; it is only temporarily involved in the reaction pathway and can be recovered unchanged after the reaction

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