https://usmleqa.com/?p=9440
Question: What is the regulation of glycolysis?
Answer: The regulation of glycolysis is controlled by a variety of enzymes and molecules, including ATP, glucose, and glucose6phosphate.Question: What are the key enzymes in glycolysis?
Answer: The key enzymes in glycolysis include hexokinase or glucokinase, phosphofructokinase1, phosphoglycerate kinase, and pyruvate kinase.Question: What are the reactants of the enzyme hexokinase in glycolysis?
Answer: The reactant of the enzyme hexokinase in glycolysis is glucose6phosphate.Question: What are the reactants of the enzyme glucokinase in glycolysis?
Answer: The reactant of the enzyme glucokinase in glycolysis is fructose6phosphate.Question: What are the activators of the enzyme phosphofructokinase1 in glycolysis?
Answer: The activators of the enzyme phosphofructokinase1 in glycolysis include AMP and fructose2,6bisphosphate.Question: What are the inhibitors of the enzyme phosphofructokinase1 in glycolysis?
Answer: The inhibitors of the enzyme phosphofructokinase1 in glycolysis include ATP, citrate.Question: What is the ratelimiting step of glycolysis?
Answer: The ratelimiting step of glycolysis is the reaction catalyzed by phosphofructokinase1.Question: What is the product of the enzyme phosphoglycerate kinase in glycolysis?
Answer: The product of the enzyme phosphoglycerate kinase in glycolysis is 1,3BPG and 3PG.Question: What are the reactants of the enzyme pyruvate kinase in glycolysis?
Answer: The reactant of the enzyme pyruvate kinase in glycolysis is phosphoenolpyruvate.Question: What are the inhibitors of the enzyme pyruvate kinase in glycolysis?
Answer: The inhibitors of the enzyme pyruvate kinase in glycolysis include fructose1,6bisphosphate, ATP, alanine, and glucagon. Question: How does glucose6phosphate enter glycolysis?
Answer: Glucose6phosphate enters glycolysis through the action of the enzyme hexokinase or glucokinase, which phosphorylates glucose to form glucose6phosphate.Question: How is fructose6phosphate converted to glucose6phosphate?
Answer: Fructose6phosphate is converted to glucose6phosphate through the action of the enzyme glucokinase, which phosphorylates fructose6phosphate to form glucose6phosphate.Question: How does phosphofructokinase1 control the rate of glycolysis?
Answer: Phosphofructokinase1 controls the rate of glycolysis by acting as the ratelimiting step in the pathway, meaning that its activity determines the rate at which glucose is converted to pyruvate. The activity of phosphofructokinase1 is regulated by both activators and inhibitors, including AMP and fructose2,6bisphosphate, and ATP and citrate respectively.Question: What is the role of phosphoglycerate kinase in glycolysis?
Answer: Phosphoglycerate kinase plays a crucial role in glycolysis by catalyzing the transfer of a phosphate group from 1,3bisphosphoglycerate to ADP, forming ATP and 3phosphoglycerate.Question: What is the role of pyruvate kinase in glycolysis?
Answer: Pyruvate kinase plays a crucial role in glycolysis by catalyzing the transfer of a phosphate group from phosphoenolpyruvate to ADP, forming ATP and pyruvate.Question: What is the role of alanine in the regulation of pyruvate kinase?
Answer: Alanine can act as an inhibitor of the enzyme pyruvate kinase, which regulates the rate of glycolysis. When alanine levels are high, pyruvate kinase activity is decreased, slowing the rate of glycolysis.Question: How does glucagon regulate glycolysis?
Answer: Glucagon is a hormone that regulates glycolysis by inhibiting the activity of the enzyme pyruvate kinase, which slows the rate of glycolysis. This occurs in response to low blood sugar levels, as glucagon signals the body to increase glucose production. Question: How does AMP regulate the activity of phosphofructokinase1?
Answer: AMP regulates the activity of phosphofructokinase1 by binding to the enzyme and activating it. This increases the rate of glycolysis, as more glucose is ctab