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A plot of the reaction rate, V, vs. the substrate concentration for an enzyme, alone and in the presence of either ATP and AMP, is shown below. Which of the following statements is TRUE regarding this enzyme? 10 AMP 06- +ATP 04- 02- 00- 00 0.5 15 20 2.5 [S] moles/L O A. A plot of 1/V vs. 1/[S] for this enzyme will yield a straight line O B. AMP inhibits this enzyme, but ATP activates it OC. This is an allosteric enzyme O D. All of the above O E. B and C V (moles/L sec)

A plot of the reaction rate, V, vs. the substrate concentration for an enzyme, alone and in the presence of either ATP and AMP, is shown below. Which of the following statements is TRUE regarding this enzyme? 10 AMP 06- +ATP 04- 02- 00- 00 0.5 15 20 2.5 [S] moles/L O A. A plot of 1/V vs. 1/[S] for this enzyme will yield a straight line O B. AMP inhibits this enzyme, but ATP activates it OC. This is an allosteric enzyme O D. All of the above O E. B and C V (moles/L sec)

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
Section: Chapter Questions
Problem 1P
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A plot of the reaction rate, V, vs. the substrate concentration for an enzyme, alone and in the presence of either ATP and AMP, is shown below. Which of the following statements is TRUE regarding this enzyme? 10 08 +AMP 06. +ATP 04 02 00 0.5 1.0 1.5 2.0 2.5 [S] moles/L O A. A plot of 1N vs. 1/[S] for this enzyme will yield a straight line B. AMP inhibits this enzyme, but ATP activates it C. This is an allosteric enzyme D. All of the above E. B and C V (moles/L sec)
Transcribed Image Text:A plot of the reaction rate, V, vs. the substrate concentration for an enzyme, alone and in the presence of either ATP and AMP, is shown below. Which of the following statements is TRUE regarding this enzyme? 10 08 +AMP 06. +ATP 04 02 00 0.5 1.0 1.5 2.0 2.5 [S] moles/L O A. A plot of 1N vs. 1/[S] for this enzyme will yield a straight line B. AMP inhibits this enzyme, but ATP activates it C. This is an allosteric enzyme D. All of the above E. B and C V (moles/L sec)
The activity of Enzyme X, is found to have the dependence on pH shown below. Which of the following proposals for the enzyme mechanism is consistent with this pH profile? (Amino acid pKa's are shown below on the right) Typical pK, values for ionizable amino acid side chains in proteins Amino Acid Side chain pKa Сys Туг Asp 8-9.5 9.5-10 4-5 Glu 4-5 Lys Arg ~10 ~12 His 6-7 2 4 10 pH A. the active form of the enzyme has protonated Histidine and a deprotonated Glutamate. O B. the active form of the residue has a deprotonated Lysine and protonated Histidine O C. the active form of the enzyme has a protonated Lysine and a deprotonated Histidine D. the active form of the enzyme has a deprotonated Histidine and a protonated Aspartic acid. E. the active form of the enzyme has a deprotonated Aspartate and protonated Lysine
Transcribed Image Text:The activity of Enzyme X, is found to have the dependence on pH shown below. Which of the following proposals for the enzyme mechanism is consistent with this pH profile? (Amino acid pKa's are shown below on the right) Typical pK, values for ionizable amino acid side chains in proteins Amino Acid Side chain pKa Сys Туг Asp 8-9.5 9.5-10 4-5 Glu 4-5 Lys Arg ~10 ~12 His 6-7 2 4 10 pH A. the active form of the enzyme has protonated Histidine and a deprotonated Glutamate. O B. the active form of the residue has a deprotonated Lysine and protonated Histidine O C. the active form of the enzyme has a protonated Lysine and a deprotonated Histidine D. the active form of the enzyme has a deprotonated Histidine and a protonated Aspartic acid. E. the active form of the enzyme has a deprotonated Aspartate and protonated Lysine
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