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Phosphofructokinase is an important control enzyme in the regulation of cellular respiration of cellular respiration What is statement that describes a function of phosphofructokinase?
Phosphofructokinase is responsible for catalyzing the rate-limiting step in glycolysis, which is the breakdown of glucose to produce energy in the form of ATP. This enzyme helps regulate the overall flow of glucose through the glycolytic pathway to meet the energy demands of the cell.
What is the control point in glycolysis?
The control point in glycolysis is the enzyme phosphofructokinase. This enzyme catalyzes the conversion of fructose 6-phosphate to fructose 1,6-bisphosphate, a key step in the glycolysis pathway. Phosphofructokinase activity is allosterically regulated by ATP, citrate, and AMP levels in the cell.
What are the irreversible steps in glycolysis and how do they contribute to the overall regulation of the pathway?
The irreversible steps in glycolysis are catalyzed by the enzymes hexokinase, phosphofructokinase, and pyruvate kinase. These steps help regulate the pathway by controlling the flow of glucose through glycolysis. Hexokinase converts glucose to glucose-6-phosphate, phosphofructokinase converts fructose-6-phosphate to fructose-1,6-bisphosphate, and pyruvate kinase converts phosphoenolpyruvate to pyruvate. These irreversible steps ensure that once glucose enters glycolysis, it is committed to being broken down for energy production.
What steps of glycolysis are irreversible?
The steps of glycolysis that are irreversible are the conversion of glucose to glucose-6-phosphate by hexokinase, the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate by phosphofructokinase-1, and the conversion of phosphoenolpyruvate to pyruvate by pyruvate kinase.
Which steps in glycolysis are irreversible?
The steps in glycolysis that are irreversible are the conversion of glucose to glucose-6-phosphate by hexokinase, the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate by phosphofructokinase-1, and the conversion of phosphoenolpyruvate to pyruvate by pyruvate kinase.
What is the role of phosphofructokinase-2 in glycolysis?
Phosphofructokinase-2 converts fructose-6-phosphate to fructose-2,6-bisphosphate.
What pathway is phosphofructokinase involved in?
Glycolytic and TCA cycle
Which enzyme catalyzes the rate-limiting step of glycolysis?
Phosphofructokinase (PFK)
Which of the following enzymes catalyzes the rate-limiting step of glycolysis?
Phosphofructokinase
Phosphofructokinase is an important control enzyme in the regulation of cellular respiration of cellular respiration What is statement that describes a function of phosphofructokinase?
Phosphofructokinase is responsible for catalyzing the rate-limiting step in glycolysis, which is the breakdown of glucose to produce energy in the form of ATP. This enzyme helps regulate the overall flow of glucose through the glycolytic pathway to meet the energy demands of the cell.
Which of the following is true of phosphofructokinase (PFK)?
High levels of ATP inhibit PFK
Is it true that PEP is a feedback inhibitor of Phosphofructokinase?
No, it is not true. PEP, or phosphoenolpyruvate, is actually a substrate for phosphofructokinase (PFK), a key enzyme in glycolysis. PEP is converted to fructose-1,6-bisphosphate by PFK, which is an important step in the glycolytic pathway.
Fructose-2,6-bisphosphate will strongly upregulate which of the following enzymes?
Phosphofructokinase-1 (PFK-1)
What enzymes in the glycolysis pathway in the liver catalyze irreversible reactions?
Glucokinase, phosphofructokinase-1, pyruvate kinase
Which of the following choices will result in continuous glycolysis?
Loss of allosteric binding site for ATP on phosphofructokinase-1 (PFK-1)
What is the control point in glycolysis?
The control point in glycolysis is the enzyme phosphofructokinase. This enzyme catalyzes the conversion of fructose 6-phosphate to fructose 1,6-bisphosphate, a key step in the glycolysis pathway. Phosphofructokinase activity is allosterically regulated by ATP, citrate, and AMP levels in the cell.
What is Decreased ATP production?
Cell respiration is actually a negative feedback system. If too many ATPs are produced, they will go back to the beginning of the reaction (glycolysis) and act as allosteric inhibitors to phosphofructokinase. Citrate works in the same way to inhibit the phosphofructokinase present in glycolysis and in the Krebs Cycle. However, the rate of cell respiration can increase with increasing levels of ADP, which acts as an allosteric activator.
