Glycolysis is the name given to a metabolic pathway occurring in many different

Question

Glycolysis is the name given to a metabolic pathway occurring in many different cell types. It consists of 11 enzymatic steps that convert glucose to lactic acid. Glycolysis is an example of: A) aerobic metabolism. B) anabolic metabolism. C) a net reductive process. D) fermentation, E) oxidative phosphorylation. 12. During strenuous exercise, the NADH formed in the glyceraldchyde 3-phosphate dehydrogenase reaction in skeletal muscle must be reoxidized to NAD^+ if glycolysis is to continue. The most important reaction involved in the reoxidation of NADH is: A) dihydroxyacetone phosphate glycerol 3-phosphate B) glucose 6-phosphate fructose 6-phosphate C) isocitratc -ketoglutarate D) oxaloacetate malate E) pyruvate lactate 13. The conversion of 1 mol of fructose 1,6-bisphosphate to 2 mol of pyruvate by the glycolytic pathway results in a net formation of: A) 1 mol of NAD+ and 2 mol of ATP. B) 1 mol of NADH and 1 mol of ATP. C) 2 mol of NAD+ and 4 mol of ATP. D) 2 mol of NADH and 2 mol of ATP. E) 2 mol of NADH and 4 mol of ATP. 14. Which of these cofactors participates directly in most of the oxidation-reduction reactions in the fermentation of glucosc to lactate? A) ADP B) ATP C) FAD/FADH_2 D) Glyceraldehyde 3-phosphate E) NAD+/NADH 15. The steps of glycolysis between glyceraldehyde 3-phosphate and 3-phosphoglycerate involve all of the following except: A) ATP synthesis. B) catalysis by phosphoglycerate kinase. C) oxidation of NADH to NAD^+. D) the formation of 1,3-bisphosphoglycerate. E) utilization of Pi.

Explanation / Answer

11) Glycolysis is an oxygen independent metabolic pathway, meaning that it does not use molecular oxygen. But glycolysis occurs, with variations, in nearly all organisms, both aerobic and anaerobic.The end result of Glycolysis is two new pyruvate molecules which can then be fed into the Citric Acid cycle (also known as the Kreb's Cycle) if oxygen is present, or can be reduced to lactate or ethanol in the absence of of oxygen using a process known as Fermentation. the first step of glycolysis is phosphorylation of glucose to give glucose 6-phosphate. It is a reductie process which convert NAD+ to NADH. So all the answers are correct

12)The regeneration of NAD+in the reduction of pyruvate to lactate sustains the continued operation of glycolysis under strenuous conditions.

13) 2 mols of NADH and 4 mols of ATP will form

14) the cofactor is ATP

15) catalysis by phosphoglycerate kinase is not involved in the step

Related Questions

Navigate

• Browse (All)
• Browse G
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.