Enzymes MCQs (Quiz 2)By guishaqasif / April 27, 2026 1. ___________ of the following is a coenzyme Mg²⁺ NAD⁺ Fe²⁺ Zn²⁺ 2. Apoenzyme combined with its prosthetic group forms ________ Modified apoenzyme Inactive enzyme Holoenzyme Zymogen 3. In alcohol dehydrogenase, Zn²⁺ functions as a ___________ Coenzyme Competitive inhibitor Apoenzyme component Tightly bound metal cofactor 4. Which statement about cofactors is INCORRECT? Prosthetic groups are loosely bound Metal ions can act as cofactors Coenzymes are organic cofactors Apoenzymes require cofactors for activity 5. Allosteric enzymes are most commonly associated with catalyzing which step in a metabolic pathway? Rate-limiting, committed steps that control pathway flux Spontaneous reactions that occur without enzymatic catalysis Substrate-independent reactions that proceed without regulation Reversible near-equilibrium reactions toward the end of the pathway 6. _____________ is the metal ion that commonly functions as a cofactor in both kinases and DNA polymerases Na⁺ Fe²⁺ Mg²⁺ Cu²⁺ 7. Coenzymes are most commonly derived from ___________ Nucleic acids Lipids Vitamins Carbohydrates 8. Metal ion catalysis primarily stabilizes _______ Enzyme only Transition state charges Substrate only Product only 9. Feedback inhibition in enzymatic pathways ensures _______ Overproduction of the end product Accumulation of substrate intermediates Maintenance of metabolic homeostasis Irreversible inactivation of the enzyme 10. __________ is a cofactor that is tightly bound to an enzyme Substrate analog Metal activator Prosthetic group Coenzyme Loading … Question 1 of 10
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