In feedback inhibition, the end product of a metabolic pathway usually binds to
Correct answer: B. an allosteric site on the first enzyme of the pathway
- A. the substrate of the first reaction
- B. an allosteric site on the first enzyme of the pathway
- C. the active site of every enzyme in the cell
- D. the DNA that codes for the pathway
Explanation
The end product docks at a regulatory site on the pathway's first committed enzyme, changing its shape and shutting production until the product is used up. Binding the substrate or the DNA would be too slow and too blunt for minute-to-minute control.
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About Characteristics of Enzymes
Enzymes are globular biological catalysts that lower activation energy without being consumed, usually showing specificity for particular substrates. Questions cover active sites, enzyme substrate complexes, the lock and key and induced fit models, intracellular and extracellular action, and the effects of denaturation, while distinguishing enzymes from non biological catalysts.
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