Why was absorbance measured at 420 nm in the enzyme kinetics experiment? To  monitor the

Biochemistry
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ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
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Chapter1: Biochemistry: An Evolving Science
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pls explain

Why was absorbance measured at 420 nm in the enzyme kinetics experiment? To 
monitor the
a. decrease in catechol concentration
b. increase in quinone concentration
c. decrease in polyphenol oxidase concentration
d. polyphenol oxidase-catechol complex concentration

Lineweaver-Burk plot is the most used linearization method of the MichaelisMenten equation, but the main drawback is a/an:
a. overemphasis to low substrate concentration and less emphasis to high 
substrate concentration.
b. overemphasis to high substrate concentration and less emphasis to low 
substrate concentration.
c. exaggeration to both ends of the reciprocal of the substrate concentration.
d. lack of independent variables to x- and y- coordinates

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