Question

On plotting a graph between substrate concentration and time, a scientist found a sigmoid curve. The enzyme is

• A. Allosteric
• B. Apoenzyme
• C. Mono enzyme
• D. Isozyme

Answer 1

The correct option is A Allosteric

Allosteric enzymes are the enzymes which possess an allosteric site for binding of allosteric modulators in addition to the active site for binding of substrate molecules. A non allosteric enzyme or an enzyme which follows Michalis-Menten kinetics shows a hyperbolic curve for rate of chemical reaction plotted against substrate concentration. An allosteric enzyme on the other hand shows a sigmoidal curve.

So, the correct answer is 'Allosteric'