An irreversible inhibitor differs from a reversible one in that it
Correct answer: D. forms permanent covalent bonds with the enzyme
- A. can be removed simply by dilution
- B. binds only at the allosteric site
- C. attaches by weak hydrogen bonds
- D. forms permanent covalent bonds with the enzyme
Explanation
Irreversible poisons chemically modify amino acids at or near the active site, so the enzyme is permanently disabled and the cell must make new molecules. Reversible inhibitors bind weakly and fall off, so their effect depends on concentration.
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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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