Uncompetitive inhibitors bind to enzymes at a site other than the enzyme’s active site. Accordingly, A)...
Uncompetitive inhibitors bind to enzymes at a site other than the enzyme’s active site. Accordingly,
A) Uncompetitive inhibitors can be outcompeted by substrate
B) Uncompetitive inhibitors do not change the Vmax of an enzyme
C) On a Lineweaver-Burke plot, increases in the concentration of uncompetitive inhibitor result in a y intercept that is further from the origin. Ie. a decrease in the Vmax
Homework Answers
uncompetitive inhibitors bind to the Enzyme-substrate complex and uncompetitive inhibitors decrease both Vmax and Km so the answer is
C) On a Lineweaver-Burke plot, increases in the concentration of uncompetitive inhibitor result in a y-intercept that is further from the origin. Ie. a decrease in the Vmax
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Uncompetitive
inhibitors bind to enzymes at a site other than the enzyme’s active
site. Accordingly,
A)...
Biochemistry inhibitors! Pls answer 1 through 11 For each of the following items, indicate whether the...
Biochemistry inhibitors! Pls answer 1 through 11
For each of the following items, indicate whether the item pertains to: • Competitive inhibitor . Uncompetitive inhibitor • Noncompetitive inhibitor • Noncompetitive activator • None of the above Choose only one of the above for each item. 1. Binds to the enzyme-substrate complex only 2. Prevents substrate from binding enzyme 3. Forms inactive El or inactive ESI complex 4. When present, Vmax increases 5. When present, Vmax increases and Km decreases 6....
3. Why is an allosteric enzyme more sensitive to substrate concentration around Km values than a...
3. Why is an allosteric enzyme more sensitive to substrate concentration around Km values than a Michaelis-Menten enzyme with the same Vmax? 4. Explain how pH and temperature influence enzyme activity. ( A Lineweaver-Burk (double reciprocal) plot was used to compare the effects of three different reversible inhibitors (A, B and C) on an enzyme. The plot of 1/V vs 1/[S] for the enzyme with no inhibitor is shown in a solid black line. The plot of 1/V vs 1/[S]...
Questions #1-2 refer to Atorvastatin, which is a competitive inhibitor of the rate limiting step of...
Questions #1-2 refer to Atorvastatin, which is a competitive inhibitor of the rate limiting step of cholesterol biosynthesis. 1. What is the downstream effect of treating cells with this competitive inhibitor? A. Atorvastatin decreases the Vmax of HMG CoA synthase. B. Atorvastatin decreases the KM of HMG CoA synthase. C. Atorvastatin decreases the Vmax of HMG CoA reductase. D. Atorvastatin decreases the KM of HMG CoA reductase. E. Atorvastatin increases the KM of HMG CoA reductase. 2. Mechanistically, how does...
4. Noncompetitive inhibitors: a) bind to the active site b) bind to the enzyme-substrate complex c)...
4. Noncompetitive inhibitors: a) bind to the active site b) bind to the enzyme-substrate complex c) bind outside the active site and decrease substrate binding d) bind outside the active site and decrease rate of catalysis. 5. Which statement best describes the effect of pH upon enzyme catalyzed reactions? a) rate increases with increasing pH b) rate decreases with increasing pH c) rate increases with increasing pH until the denaturation pH is reached d) every enzyme has an optimum pH...
1. Protein kinases phosphorylate target enzymes and as a result enzymes become activated or inactivated. Which...
1. Protein kinases phosphorylate target enzymes and as a result enzymes become activated or inactivated. Which of the statements are TRUE? (Multiple answers: You can select more than one option) A. Phosphorylated enzymes behave like competitive inhibitors B The presence of a phosphate acts as a non-competitive inhibitor/activator. No change in Km but significant change in Vmax C. The presence of a phosphate group induces a conformational change that modifies the affinity and catalytic ability of a target enzyme D....
1 2 3 4 5 6 7 8 9 Part A Which of the following is/are...
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Part A Which of the following is/are means whereby a catalyst can lower the activation energy of a reaction? quantum tunneling decreasing the number of reactive molecules permanently binding substrates inefficient collisions altering the temperature within the cell to one appropriate for reactions to proceed Subrnit Request Answer Part A An enzyme Obinds substrates in a manner that facilitates the formation of product decreases the rate of a reaction. is always...
QUESTION 28 Among the following statements concerning the enzymes, all correct answers An apoenzyme consists of...
QUESTION 28 Among the following statements concerning the enzymes, all correct answers An apoenzyme consists of a holoenzyme and a.coenzyme Enzymes are biological catalysts that do not affect the reaction equilibrium The rate of reaction depends on the pH The catalytic site is formed of an active site and binding sites The activation energy of the uncatalyzed reaction is greater than the activation energy of the catalyzed reaction QUESTION 29 Which of the following statements are corrects? When the substrate...
A. Choose anly one correcet answer for each of the following questions (4 pts cach). AL Some and ...
A. Choose anly one correcet answer for each of the following questions (4 pts cach). AL Some and KM values are shown below for enzyme-substrate pairs. Which of the following enzymes is most efficient in converting the substrate into the product? b) kes.-4x10s s", KM-0.026 M d)k,,-5.7 x1o's", K-2x10s M c)人at-900 s", KM-2.5 × 10.5 M A2. Which of the following enzyme reaction mechanisms has multiple substrates? a) induced-fit e) Michaclis-Menton b) random sequential d) reversible covalent modification e) None...
The rate of an enzyme-catalyzed reaction initially increases with an increase in the substrate concentration, but...
The rate of an enzyme-catalyzed reaction initially increases with an increase in the substrate concentration, but eventually reaches a maximum value, even though the concentration of substrate continues to increase. Which of the following best explains why? O As substrate concentration increases, the substrates preferentially bind with each other instead of the active site of the enzyme, and no additional catalysis occurs. As substrate concentration increases, the active sites of all the enzyme molecules become occupied with substrate molecules, and...
Which amino acids in chymotrypsin are found in the active site and are participants in substrate...
Which amino acids in chymotrypsin are found in the active site and are participants in substrate cleavage? His, Ser, Asp His, Ser, Arg His, Ser Lys, Ser, Asp Where does cleavage of the peptide bond by chymotrypsin occur? On the C-terminal side of positively charged residues (lysine or). On the N-terminal side of aromatic residues (e.g. phonylalanine or tryprophase). On the C-terminal side of aromatic residues (e.g. phenylalanine or). All of the above When substrate concentration is much greater than...
Biochemistry inhibitors! Pls answer 1 through 11
For each of the following items, indicate whether the item pertains to: • Competitive inhibitor . Uncompetitive inhibitor • Noncompetitive inhibitor • Noncompetitive activator • None of the above Choose only one of the above for each item. 1. Binds to the enzyme-substrate complex only 2. Prevents substrate from binding enzyme 3. Forms inactive El or inactive ESI complex 4. When present, Vmax increases 5. When present, Vmax increases and Km decreases 6....
3. Why is an allosteric enzyme more sensitive to substrate concentration around Km values than a Michaelis-Menten enzyme with the same Vmax? 4. Explain how pH and temperature influence enzyme activity. ( A Lineweaver-Burk (double reciprocal) plot was used to compare the effects of three different reversible inhibitors (A, B and C) on an enzyme. The plot of 1/V vs 1/[S] for the enzyme with no inhibitor is shown in a solid black line. The plot of 1/V vs 1/[S]...
4. Noncompetitive inhibitors: a) bind to the active site b) bind to the enzyme-substrate complex c) bind outside the active site and decrease substrate binding d) bind outside the active site and decrease rate of catalysis. 5. Which statement best describes the effect of pH upon enzyme catalyzed reactions? a) rate increases with increasing pH b) rate decreases with increasing pH c) rate increases with increasing pH until the denaturation pH is reached d) every enzyme has an optimum pH...
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Part A Which of the following is/are means whereby a catalyst can lower the activation energy of a reaction? quantum tunneling decreasing the number of reactive molecules permanently binding substrates inefficient collisions altering the temperature within the cell to one appropriate for reactions to proceed Subrnit Request Answer Part A An enzyme Obinds substrates in a manner that facilitates the formation of product decreases the rate of a reaction. is always...
QUESTION 28 Among the following statements concerning the enzymes, all correct answers An apoenzyme consists of a holoenzyme and a.coenzyme Enzymes are biological catalysts that do not affect the reaction equilibrium The rate of reaction depends on the pH The catalytic site is formed of an active site and binding sites The activation energy of the uncatalyzed reaction is greater than the activation energy of the catalyzed reaction QUESTION 29 Which of the following statements are corrects? When the substrate...
A. Choose anly one correcet answer for each of the following questions (4 pts cach). AL Some and KM values are shown below for enzyme-substrate pairs. Which of the following enzymes is most efficient in converting the substrate into the product? b) kes.-4x10s s", KM-0.026 M d)k,,-5.7 x1o's", K-2x10s M c)人at-900 s", KM-2.5 × 10.5 M A2. Which of the following enzyme reaction mechanisms has multiple substrates? a) induced-fit e) Michaclis-Menton b) random sequential d) reversible covalent modification e) None...
The rate of an enzyme-catalyzed reaction initially increases with an increase in the substrate concentration, but eventually reaches a maximum value, even though the concentration of substrate continues to increase. Which of the following best explains why? O As substrate concentration increases, the substrates preferentially bind with each other instead of the active site of the enzyme, and no additional catalysis occurs. As substrate concentration increases, the active sites of all the enzyme molecules become occupied with substrate molecules, and...
Which amino acids in chymotrypsin are found in the active site and are participants in substrate cleavage? His, Ser, Asp His, Ser, Arg His, Ser Lys, Ser, Asp Where does cleavage of the peptide bond by chymotrypsin occur? On the C-terminal side of positively charged residues (lysine or). On the N-terminal side of aromatic residues (e.g. phonylalanine or tryprophase). On the C-terminal side of aromatic residues (e.g. phenylalanine or). All of the above When substrate concentration is much greater than...
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