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A Lineweaver-Burk plot generates a line with the following formula: y = 0.3x + 0.4. What is the Km?
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6. Enzymes and Enzyme Kinetics
Lineweaver-Burk Plot
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To determine the Vmax from a Lineweaver-Burk plot you would:
A
Multiply the reciprocal of the x-axis intercept by -1.
B
Multiply the reciprocal of the y-axis intercept by -1.
C
Take the reciprocal of the x-axis intercept.
D
Take the reciprocal of the y-axis intercept.
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Understand that a Lineweaver-Burk plot is a double reciprocal plot used to analyze enzyme kinetics, where the x-axis represents 1/[S] (the reciprocal of substrate concentration) and the y-axis represents 1/V (the reciprocal of reaction velocity).
Recall that the Lineweaver-Burk equation is given by: , where Km is the Michaelis constant and Vmax is the maximum reaction velocity.
Identify that the y-intercept of the Lineweaver-Burk plot corresponds to .
To find Vmax, take the reciprocal of the y-intercept value from the Lineweaver-Burk plot.
By taking the reciprocal of the y-intercept, you obtain Vmax, which represents the maximum rate of the enzymatic reaction when the enzyme is saturated with substrate.
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