Question

multiple choice question

what term refers to a biological catalyst that lacks an essential cofactor?

hapten
vitamin
apoenzyme
enzyme

Explanation:

Identify the biological catalyst lacking its cofactor

An enzyme that requires a cofactor to function but is currently lacking it is called an apoenzyme. It is the inactive protein portion of the enzyme.

Define the related terms

• Apoenzyme: The inactive protein component of an enzyme that requires a cofactor/coenzyme to become active.
• Holoenzyme: The active, complete enzyme consisting of the apoenzyme combined with its necessary cofactor.
• Hapten: A small molecule that can elicit an immune response only when attached to a large carrier such as a protein.
• Vitamin: An organic compound required as a vital nutrient in limited amounts, often serving as a precursor to coenzymes.
• Enzyme: A general term for macromolecular biological catalysts.

Select the correct option

The term specifically referring to a biological catalyst lacking an essential cofactor is "Apoenzyme".

Answer:

• Hapten
• Vitamin
• Apoenzyme (Correct answer)
• Enzyme