Biochemistry : Reactants and Products of Glycolysis
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Example Question #41 : Glycolysis
Which process involved in cellular respiration does not yield any high energy phosphate bonds?
All of these produce new high energy phosphate bonds
Glycolysis
Pyruvate dehydrogenase complex
Krebs cycle
Electron transport chain/ATP synthase
Pyruvate dehydrogenase complex
Glycolysis has a net yield of 2 ATP per glucose molecules. The Krebs cycle produces 2 GTP molecules per glucose. The electron transport chain and ATP synthase are the main producers of ATP in cellular respiration. The pyruvate dehydrogenase complex, however, does not yield any ATP (or any other nucleoside phosphates). It simply produces acetyl-CoA from pyruvate, releasing one molecule of carbon dioxide per pyruvate.
Example Question #11 : Reactants And Products Of Glycolysis
What enzymes in the glycolysis pathway in the liver catalyze irreversible reactions?
Aldolase, phosphofructokinase-1, mutase
Glucokinase, pyruvate kinase, enolase
Glucokinase, phosphofructokinase-1, pyruvate kinase
Isomerase, aldolase, mutase
Glucokinase, phosphoglycerate kinase, mutase
Glucokinase, phosphofructokinase-1, pyruvate kinase
In the liver, glucokinase irreversibly converts glucose in the cell to glucose-6-phosphate. Phosphofructose kinase-1 irreversibly converts fructose-6-phosphate to fructose-1,6-bisphosphate. Pyruvate kinase converts phosphoenolpyruvate to pyruvate. All the other enzymes listed catalyze reversible glycolysis reactions.
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