At a very low concentration of a certain substrate, we find...

Name: Problem 13, Chapter 22: Introduction to General, Organic and Biochemistry
Uploaded: 2020-07-13T16:17:18-08:00
Duration: 1 min 14 s
Channel: Simon Sauvageau
Description: At a very low concentration of a certain substrate, we find that when the substrate concentration doubles, the rate of the enzyme-catalyzed reaction also doubles. Would you expect the same finding at a very high substrate concentration? Explain.

At a very low concentration of a certain substrate, we find that when the substrate concentration doubles, the rate of the enzyme-catalyzed reaction also doubles. Would you expect the same finding at a very high substrate concentration? Explain.

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Key Concepts

Michaelis-Menten Kinetics

This concept explains how the rate of an enzyme-catalyzed reaction depends on substrate concentration in a hyperbolic relationship. At low substrate concentrations, the rate increases nearly proportionally to substrate concentration, but at high concentrations, the rate levels off and approaches a maximum velocity (Vmax) because the enzyme's active sites become fully occupied.

Enzyme Saturation

Enzyme saturation occurs when almost all of the enzyme's active sites are bound by substrate molecules, making further increases in substrate concentration ineffective in increasing the reaction rate. At high substrate levels, the enzyme is operating at or near its maximum capacity, leading to a plateau in reaction rate.

Reaction Order Dependence

In enzyme-catalyzed reactions, the reaction order with respect to substrate can change based on concentration. At low substrate concentrations, the reaction often exhibits first-order kinetics, where the rate is directly proportional to the substrate concentration. At high substrate concentrations, it shifts to zero-order kinetics since the rate is independent of substrate concentration due to enzyme saturation.

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