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The following graph illustrates the effect of different concentrations of a substrate on the rate of a cellular reaction - VCE - SSCE Biology - Question 17 - 2003 - Paper 1
Question 17
The following graph illustrates the effect of different concentrations of a substrate on the rate of a cellular reaction. In this series of experiments, the amount ... show full transcript
Worked Solution & Example Answer:The following graph illustrates the effect of different concentrations of a substrate on the rate of a cellular reaction - VCE - SSCE Biology - Question 17 - 2003 - Paper 1
Step 1
The limiting factor at point X is the
Answer
At point X on the graph, the rate of reaction levels off, indicating that increasing substrate concentration no longer influences the reaction rate. Since the amount of enzyme is constant, the reaction is at its maximum catalytic capacity. Thus, the limiting factor is the amount of enzyme, as there are no longer enough enzymes available to react with the additional substrate. Therefore, the correct answer is C. amount of enzyme.