A student performed investigations at $\text{pH }1$-$8$ in order to examine how $\text{pH}$ affects an enzyme-catalysed reaction. The best condition for this enzyme is the acidic conditions in the stomach at $\text{pH }1$-$2$. The concentration of substrate left was recorded after five minutes at each separate $\text{pH}$. Which graph shows the effect of increasing $\text{pH}$ on substrate concentration remaining after five minutes?
Biology 9700 · AS & A Level · Factors that affect enzyme action