Apentix/AP Biology/Unit 1: Chemistry of Life/Question

AP Biologyeasymcq1 pt

Which statement about biological catalysts is most accurate?

A.All biological catalysts are lipids embedded in cell membranes.

B.Most enzymes are proteins, though some RNA molecules are catalytic

C.Every enzyme is a protein, and catalytic RNA never occurs.

D.Only RNA molecules can catalyze reactions inside living cells.

Explanation

Core Concept

Most biological enzymes are proteins whose three-dimensional structures create catalytic sites. Some RNA molecules are also catalytic and are called ribozymes, so 'all enzymes are proteins' is too absolute.

Correct Answer

BMost enzymes are proteins, though some RNA molecules are catalytic

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