Enzymes are biological catalysts that speed up chemical reactions in living systems. They are usually protein molecules, but can also be RNA molecules known as ribozymes. Option A is partially correct but incomplete, as enzymes are not necessary for the proper functioning of all organic or inorganic molecules in living systems. Options C, D, and E are incorrect, as they do not accurately describe the function or structure of enzymes.

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An Enzyme Is A(n)

Question 49

Multiple Choice

An enzyme is a(n)

A) organic or inorganic molecule or ion necessary for proper functioning of biological catalysts.
B) catalyst for chemical reactions in a living system.
C) protein molecule whose primary function is transport of insoluble molecules in the bloodstream.
D) molecule that is acted on by a catalyst in a living system.
E) biological molecule used for storage of energy.

Correct Answer: