The graph represents the relationship between substrate concentration and enzyme activity for a metabolic reaction - HSC - SSCE Biology - Question 7 - 2003 - Paper 1

Based on the graph provided, we can analyze the relationship between substrate concentration and enzyme activity. The graph typically shows an initial increase in enzyme activity as the substrate concentration rises, reaching a maximum level at Point A.

From this point onward, further increase in substrate concentration does not lead to an increase in enzyme activity, indicating that all active sites of the enzyme are occupied.

Given the options:

• Option (A) is incorrect as it refers to enzyme concentration, rather than substrate concentration.
• Option (B) is correct because, past Point A, further increases in substrate concentration won't raise the rate of reaction due to saturation.
• Option (C) is incorrect since it contradicts the graph's implication about saturation.
• Option (D) is also incorrect as it misinterprets enzyme activity dynamics.

Thus, the correct interpretation is Option (B): Increasing substrate concentration beyond Point A will not increase the rate of reaction.