February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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16Enzymes Enzyme KineticsMedium1 mark
Some students sketched graphs to show and .
Which graph is correct?
Graph A: rate of reaction (y-axis) against enzyme concentration (x-axis); a curve rising from the origin to a plateau at $V_{max}$, with $K_{m}$ marked on the x-axis at the concentration giving half of $V_{max}$
Graph B: rate of reaction (y-axis) against enzyme concentration (x-axis); a curve rising from the origin to a plateau at $V_{max}$, with $K_{m}$ marked on the y-axis at the rate half-way up the curve
Graph C: rate of reaction (y-axis) against substrate concentration (x-axis); a curve rising from the origin to a plateau at $V_{max}$, with $K_{m}$ marked on the x-axis at the concentration giving half of $V_{max}$
Graph D: rate of reaction (y-axis) against substrate concentration (x-axis); a curve rising from the origin to a plateau at $V_{max}$, with $K_{m}$ marked on the y-axis at the rate half-way up the curve