Glycolysis 2

The video tutorial covers the glycolysis pathway, focusing on the preparatory and payoff phases. It explains the role of key enzymes like glyceraldehyde-3-phosphate dehydrogenase, phosphoglycerate kinase, and pyruvate kinase in ATP and NADH production. The tutorial also discusses the irreversible steps in glycolysis and the regulation of these processes. Additionally, it touches on the importance of phosphoenolpyruvate and pyruvate in cellular metabolism.

What is the initial product formed from glucose in the preparatory phase of glycolysis?

• Acetyl CoA

• Fructose 1,6-bisphosphate

• Glyceraldehyde 3-phosphate

• Pyruvate

Which enzyme is responsible for the first production of NADH in glycolysis?

• Pyruvate kinase

• Phosphofructokinase

• Glyceraldehyde 3-phosphate dehydrogenase

• Hexokinase

What is the role of phosphoglycerate kinase in glycolysis?

• It converts glucose to glucose-6-phosphate.

• It catalyzes the conversion of 1,3-bisphosphoglycerate to 3-phosphoglycerate.

• It phosphorylates fructose-6-phosphate.

• It converts pyruvate to lactate.

What is the function of phosphoglycerate mutase in glycolysis?

• It converts 3-phosphoglycerate to 2-phosphoglycerate.

• It converts fructose-1,6-bisphosphate to glyceraldehyde 3-phosphate.

• It converts glucose to glucose-6-phosphate.

• It converts pyruvate to acetyl CoA.

Which principle explains the direction of the phosphoglycerate mutase reaction?

• Newton's third law

• Avogadro's law

• Boyle's law

• Le Chatelier's principle

What is the high-energy molecule formed before pyruvate in glycolysis?

• Acetyl CoA

• Phosphoenolpyruvate

• NADH

• ATP

Why is the reaction catalyzed by pyruvate kinase considered irreversible?

• It involves the formation of a stable product.

• It has a very positive Delta G.

• It requires ATP input.

• It has a very negative Delta G.

What is the net gain of ATP molecules in glycolysis?

• 4 ATP

• 0 ATP

• 2 ATP

• 6 ATP

Which complex does pyruvate enter after glycolysis?

• Citric acid cycle

• Glycogen synthesis pathway

• Electron transport chain

• Pyruvate dehydrogenase complex

What is the total number of NADH molecules produced per glucose molecule during glycolysis?

• 3 NADH

• 4 NADH

• 2 NADH

• 1 NADH