The protein portion of an enzyme complex is called the apoenzyme.

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Prepare for the BOC Clinical Chemistry Test with our comprehensive quiz. Study with multiple choice questions and detailed explanations. Enhance your readiness and confidence for the exam!

Multiple Choice

The protein portion of an enzyme complex is called the apoenzyme.

Explanation:
The key idea is how enzymes are built from a protein part and a nonprotein part. The protein portion of an enzyme is called the apoenzyme, which on its own is inactive. When a nonprotein component binds to it—often an inorganic ion or an organic molecule—the two parts form the holoenzyme, the active enzyme. A coenzyme is a type of nonprotein helper that can be part of that nonprotein component. A proenzyme (zymogen) is an inactive precursor that must be activated by proteolysis, not the protein portion itself. So the statement correctly identifies the protein portion as the apoenzyme.

The key idea is how enzymes are built from a protein part and a nonprotein part. The protein portion of an enzyme is called the apoenzyme, which on its own is inactive. When a nonprotein component binds to it—often an inorganic ion or an organic molecule—the two parts form the holoenzyme, the active enzyme. A coenzyme is a type of nonprotein helper that can be part of that nonprotein component. A proenzyme (zymogen) is an inactive precursor that must be activated by proteolysis, not the protein portion itself. So the statement correctly identifies the protein portion as the apoenzyme.

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