What is a holoenzyme?

Enzyme Components and Functions

Flashcard
•
Biology
•
University
•
Hard

Kristen Humphries
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1.
FLASHCARD QUESTION
Front
Back
A complete, active enzyme consisting of an apoenzyme (protein part) and a cofactor (non-protein part). It is the functional form of the enzyme.
2.
FLASHCARD QUESTION
Front
What is an apoenzyme?
Back
The inactive protein part of an enzyme that requires a cofactor to become active.
3.
FLASHCARD QUESTION
Front
What is a prosthetic group?
Back
A tightly or permanently bound non-protein component of an enzyme, which is essential for its activity (e.g., heme in hemoglobin).
4.
FLASHCARD QUESTION
Front
What is a coenzyme?
Back
A loosely bound organic molecule (often derived from vitamins) that assists enzyme function by carrying chemical groups or electrons (e.g., NAD⁺, FAD, Coenzyme A).
5.
FLASHCARD QUESTION
Front
What is a cofactor?
Back
A non-protein substance (which can be an inorganic ion or organic molecule) required for enzyme activity. It includes both metal ions (e.g., Mg²⁺, Zn²⁺) and coenzymes.
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