The enzyme phosphofructokinase-1 (PFK-1) catalyzes the 3rd reaction in glycolysis. When AMP concentrations are very high,...
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Phosphofructokinase-1 (PFK-1) catalyzes the 3rd reaction in glycolysis. When AMP concentrations are very high, AMP binds to PFK-1, activating it. This is an example of:
2) Allosteric activation
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The
enzyme phosphofructokinase-1 (PFK-1) catalyzes the 3rd reaction in
glycolysis. When AMP concentrations are very high,...
Why is the activity of Phosphofructokinase (PFK-1) high at moderate concentrations of ATP and low at...
Why is the activity of Phosphofructokinase (PFK-1) high at moderate concentrations of ATP and low at high concentrations of ATP? When there is a lot of ATP, it gets consumed more rapidly in other processes, which decreases the ability of PFK-1 to use it. ATP is a competitive inhibitor of PFK-1. At high concentrations ATP is an allosteric inhibitor of PFK-1. ATP phosphorylates PFK-1, inactivating it. What is required for fermentation? O2 ATP NADH Pyruvate Both NADH and pyruvate
PEK-1 is an enzyme that catalyzes step 3 of glycolysis. The activity of this enzyme is...
PEK-1 is an enzyme that catalyzes step 3 of glycolysis. The activity of this enzyme is regulated in the following ways: O either ADP or ATP can bind a particular regulatory site on this allosteric enzyme. O if ATP is bound to the regulatory site, the enzyme's activity rate increases. if ADP is bound to the regulatory site, the enzyme's activity rate increase. high levels of citrate indicate that the CAC is not keeping up, citrate binds to the regulatory...
QUESTION 6 True or false: Anaerobic organisms cannot make ATP. True O False QUESTION 7 Which...
QUESTION 6 True or false: Anaerobic organisms cannot make ATP. True O False QUESTION 7 Which of the following is a reactant of the first reaction of glycolysis? O Glucose O ADP ОАТР O 02 O Both glucose and ATP QUESTION 8 Each of the following is a high-energy product of glycolysis. From which of these can anaerobic organisms harvest the stored energy? I.e. Which of these is/are useful to an anaerobe? ОАТР O NADH O Pyruvate O All of...
Training Question 3. Shown below is the activity profile for the enzyme phosphofructokinase-1 (PFK-1) which catalyzes...
Training Question 3. Shown below is the activity profile for the enzyme phosphofructokinase-1 (PFK-1) which catalyzes the reaction: Fructose 6-phosphate + ATP → fructose 1,6-biphosphate + ADP. Low (ATPI PFK-1 activity High (ATP) [Fructose 6-phosphatel Describe the different patterns of regulation for different ATP levels. Explain the why such regulation is appropriate for this enzyme, given its role in metabolism.
Question 4 Q . OH ATP OH POH ОН Fructose 6-phosphate Fructose 1.6-bisphosphate Figure 1. Reaction...
Question 4 Q . OH ATP OH POH ОН Fructose 6-phosphate Fructose 1.6-bisphosphate Figure 1. Reaction catalyzed by phosphofructokinase (PFK) during glycolysis Phosphofructokinase (PFK) is an enzyme that catalyzes the conversion of fructose 6- phosphate to fructose 1,6-bisphosphate during glycolysis, as represented in Figure 1. PFK can be allosterically inhibited by ATP at high concentrations. Which of the following is the benefit of regulating glycolysis by the concentration of ATP? Glycolysis proceeds when the intracellular concentration of ATP is low,...
QUESTION 1 Which of the following is NOT a product of the Citric Acid Cycle? O...
QUESTION 1 Which of the following is NOT a product of the Citric Acid Cycle? O Citric acid O CO2 O NADH O FADH2 O All of the above are products QUESTION 2 What do glycolysis and the Citric Acid Cycle have in common? O They both involve oxidation of glucose. O They both occur in the cytoplasm. O They both produce CO2 O They both produce ATP and NADH QUESTION 3 Pyrimidines are synthesized through a long series of...
0.01 M A PFK-1 wity 2 mM ATT 02 M AMT -2 MATT 0 1.0 20...
0.01 M A PFK-1 wity 2 mM ATT 02 M AMT -2 MATT 0 1.0 20 (RSP) MM According to the graph, which of the Vmax? According to the graph, which of the following best explains why curve C reaches AMP has a weak affinity for the regulatory site so ATP does not interfere with the reaction. ATP has a better affinity for the catalytic domain than the regulatory domain, thus binds in active site when concentrations of ATP are...
CILI ULIULIS. Question 2 The reason enzyme catalyzed reaction rates have a maximum velocity at high...
CILI ULIULIS. Question 2 The reason enzyme catalyzed reaction rates have a maximum velocity at high substrate concentrations is: Enzymes denature at high substrate concentrations. O None of the answers are correct. The enzyme active sites are saturated. O If enzymes go too fast they make mistakes. O The build-up of product limits the rate of the reaction. Question 3 TILS LICTULUGTCAICONI Question 3 4 pts For a plot of velocity vs. [S] where the maximal velocity of the uninhibited...
12. Which of the following statements is true of enzyme catalysts? A B C To be...
12. Which of the following statements is true of enzyme catalysts? A B C To be effective, they must be present at the same concentration as their substrate. They can increase the equilibrium constant for a given reaction by a thousand-fold or more. They lower the activation energy for conversion of substrate to product. Their catalytic activity is independent of pH. They are generally equally active on D and L isomers of a given substrate. D E 13. In competitive...
Please help me with ALL of these questions. Thank you so much Question 13 0.4 pts...
Please help me with ALL of these questions. Thank you so
much
Question 13 0.4 pts For each two carbon molecule (i.e., acetyl) that enters the citric acid cycle, how many molecules of waste CO2 are produced? 0 0 0 0 0 3 Question 14 0.4 pts Which stage of respiration reduces the most electron carriers? citric acid cycle glycolysis acetyl-CoA synthesis Question 16 0.3 pts How is a Carbon atom oxidized during a redox reaction if it has the...
PEK-1 is an enzyme that catalyzes step 3 of glycolysis. The activity of this enzyme is regulated in the following ways: O either ADP or ATP can bind a particular regulatory site on this allosteric enzyme. O if ATP is bound to the regulatory site, the enzyme's activity rate increases. if ADP is bound to the regulatory site, the enzyme's activity rate increase. high levels of citrate indicate that the CAC is not keeping up, citrate binds to the regulatory...
QUESTION 6 True or false: Anaerobic organisms cannot make ATP. True O False QUESTION 7 Which of the following is a reactant of the first reaction of glycolysis? O Glucose O ADP ОАТР O 02 O Both glucose and ATP QUESTION 8 Each of the following is a high-energy product of glycolysis. From which of these can anaerobic organisms harvest the stored energy? I.e. Which of these is/are useful to an anaerobe? ОАТР O NADH O Pyruvate O All of...
Training Question 3. Shown below is the activity profile for the enzyme phosphofructokinase-1 (PFK-1) which catalyzes the reaction: Fructose 6-phosphate + ATP → fructose 1,6-biphosphate + ADP. Low (ATPI PFK-1 activity High (ATP) [Fructose 6-phosphatel Describe the different patterns of regulation for different ATP levels. Explain the why such regulation is appropriate for this enzyme, given its role in metabolism.
Question 4 Q . OH ATP OH POH ОН Fructose 6-phosphate Fructose 1.6-bisphosphate Figure 1. Reaction catalyzed by phosphofructokinase (PFK) during glycolysis Phosphofructokinase (PFK) is an enzyme that catalyzes the conversion of fructose 6- phosphate to fructose 1,6-bisphosphate during glycolysis, as represented in Figure 1. PFK can be allosterically inhibited by ATP at high concentrations. Which of the following is the benefit of regulating glycolysis by the concentration of ATP? Glycolysis proceeds when the intracellular concentration of ATP is low,...
QUESTION 1 Which of the following is NOT a product of the Citric Acid Cycle? O Citric acid O CO2 O NADH O FADH2 O All of the above are products QUESTION 2 What do glycolysis and the Citric Acid Cycle have in common? O They both involve oxidation of glucose. O They both occur in the cytoplasm. O They both produce CO2 O They both produce ATP and NADH QUESTION 3 Pyrimidines are synthesized through a long series of...
0.01 M A PFK-1 wity 2 mM ATT 02 M AMT -2 MATT 0 1.0 20 (RSP) MM According to the graph, which of the Vmax? According to the graph, which of the following best explains why curve C reaches AMP has a weak affinity for the regulatory site so ATP does not interfere with the reaction. ATP has a better affinity for the catalytic domain than the regulatory domain, thus binds in active site when concentrations of ATP are...
CILI ULIULIS. Question 2 The reason enzyme catalyzed reaction rates have a maximum velocity at high substrate concentrations is: Enzymes denature at high substrate concentrations. O None of the answers are correct. The enzyme active sites are saturated. O If enzymes go too fast they make mistakes. O The build-up of product limits the rate of the reaction. Question 3 TILS LICTULUGTCAICONI Question 3 4 pts For a plot of velocity vs. [S] where the maximal velocity of the uninhibited...
12. Which of the following statements is true of enzyme catalysts? A B C To be effective, they must be present at the same concentration as their substrate. They can increase the equilibrium constant for a given reaction by a thousand-fold or more. They lower the activation energy for conversion of substrate to product. Their catalytic activity is independent of pH. They are generally equally active on D and L isomers of a given substrate. D E 13. In competitive...
Please help me with ALL of these questions. Thank you so
much
Question 13 0.4 pts For each two carbon molecule (i.e., acetyl) that enters the citric acid cycle, how many molecules of waste CO2 are produced? 0 0 0 0 0 3 Question 14 0.4 pts Which stage of respiration reduces the most electron carriers? citric acid cycle glycolysis acetyl-CoA synthesis Question 16 0.3 pts How is a Carbon atom oxidized during a redox reaction if it has the...
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