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In the case of allosteric enzymes what is the graphical representation when initial velocity is plotted against substrate concentration?

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In the case of allosteric enzymes what is the graphical representation when initial velocity is plotted against substrate concentration?

(a) Straight line with negative slope

(b) Hyperbola

(c) Sigmoid curve

(d) Parabola
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The correct choice is (c) Sigmoid curve

For explanation I would say: Allosteric enzymes do not obey Michaelis-Menten kinetics. So the curve is not hyperbolic.
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