The graph shows the effect of substrate concentration on the rate of an enzyme-catalysed reaction.The CORRECT interpretation of the graph is that between points:
Correct answer: C. Y and Z the number of enzyme molecules is limiting the rate of reaction
- A. X and Y the number of enzyme molecules is limiting the rate of reaction
- B. X and Y the number of product molecules is limiting the rate of reaction
- C. Y and Z the number of enzyme molecules is limiting the rate of reaction
- D. Y and Z the number of substrate molecules is limiting the rate of reaction
Explanation
Between X and Y, increasing the substrate concentration increases the rate of reaction because all active sites of enzymes are not occupied. Between Y and Z, all enzymes are saturated and further increase in subtrate concentration does not increase the rate of reaction. So option C is correct.
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About Factors Affecting Enzyme Action
Enzyme activity changes with temperature, pH, substrate concentration and enzyme concentration because these factors affect molecular collisions and the active site. Questions also examine optimum conditions, denaturation and inhibition, while distinguishing a fall in activity caused by unsuitable conditions from permanent enzyme damage.
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