The given diagram shows molecules involved in an enzyme-controlled reaction.The CORRECT identification of X, Y and Z is
Correct answer: A. X: substrate, Y: non-competitive inhibitor Z: enzyme
- A. X: substrate, Y: non-competitive inhibitor Z: enzyme
- B. X: non-competitive inhibitor Y: enzyme Z: substrate
- C. X: substrate Y: competitive inhibitor Z: enzyme
- D. X: competitive inhibitor Y: non-competitive inhibitor Z: substrate
Explanation
In an enzyme-controlled reaction, the substrate (X) is the molecule upon which the enzyme (Z) acts. A non-competitive inhibitor (Y) binds to a site other than the active site on the enzyme, altering the enzyme's function without directly blocking the substrate from binding. This matches Option A. Option B misplaces roles, as the enzyme should facilitate interaction between substrate and inhibitor. Option C wrongly identifies a competitive inhibitor, which binds to the active site. Option D's configuration is incorrect as it does not reflect typical interactions between these molecules.
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About Enzyme Inhibitors
Enzyme inhibitors reduce reaction rate by interfering with enzyme-substrate interaction or catalytic activity. Coverage includes reversible competitive, non-competitive and uncompetitive inhibition, the effects of inhibitor concentration on reaction rate, and why competitive inhibition can be reduced by increasing substrate concentration.
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