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Factors affecting enzyme activity
Concepts tested here
- Effect of temperature and pH
All Questions
2011 AIPMT-PRE 1 question
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The curve given below shows enzymatic activity with relation to three conditions (pH, temperature and substrate concentration).
What do the two axes (x and y) represent?The curve is bell-shaped: the value on the y-axis rises to a peak and then falls.
In such graphs the dependent variable, enzyme activity, is plotted on the y-axis and the condition being varied on the x-axis.
Each enzyme shows its highest activity at a particular optimum temperature (and optimum pH); the activity declines both below and above the optimum, giving a bell-shaped curve.
At low temperature the enzyme is temporarily inactive, and at high temperature it is denatured.
With substrate concentration the curve is not bell-shaped: the velocity rises and then levels off at $V_{max}$.
Among the choices, the one consistent with the curve is x-axis: temperature and y-axis: enzyme activity.