I need help in my bio quiz that is due in an hour. Please help asap, thank you!

Question

I need help in my bio quiz that is due in an hour. Please help asap, thank you!
28. Which of the following statements about metabolic pathways is true? (2 points) a. The rate of the pathway cannot be altered by activating or inhibiting some key enzymes within the pathway b. Mtboli pathways are a series of enzyme-catalyzed reactions involving anabolism and catabolism. c. Almost all metabolic pathways are anabolic d. Metabolic pathways are dissimilar in all organisms. e. Many metabolic pathways are compartmentalized in prokaryotes 29. The end result of glycolysis includes the (2 points) a. creation of 38 molecules of ATP b. reduction of eight molecules of NAD' to NADH c. overall formation of 2 molecules of ATP d. conversion of one molecule of glucose to lactic acid. e. None of the above 30. In the first reaction of glycolysis, NAD+ gets converted to NADH. This reaction is (2 point a respiration. b. a redox reaction. c. exergonic. d. endergonic. e. fermentation. 31. Overall, four molecules of ATP are produced by glycolysis. However, the products of glycolysis are two ATP molecules, two pyruvate molecules, and two NADH molecules. Wher does the NADH go (2 points) a. Pyruvate oxidation. b. Electron transport chain. c. degraded to CO2. d. In the TCA cycle. e. None of the above 32. More free energy is harvested during the citric acid cycle than during glycolysis, but only mole of ATP is produced for each mole of acetyl CoA that enters the cycle. Most of the remaining free energy released during the citric acid cycle is (2 points) a. used to synthesize GTP b. used to reduce electron carriers. c. lost as heat. d. used to reduce pyruvate. e. converted to kinetic energy. 33. The source of electrons for the electron transport chain is (2 points) a. FADH2 b. 02 c. NADH. d. Both a and c

Explanation / Answer

28. Option B is correct. Metabolism is catalyzed by various enzymes and involves both anabolic and catabolic raction because both formation and degradation of metabolic intermediates takes place during metabolism.   

29. Option C is correct. Overall 2 molecules of ATP are produced by glycolysis. Although 4 molecules of ATP are produced during glycolysis but two molecules of ATP are consumed by glycolytic reaction. Hence overall 2 molecules are produced at the end of glycolysis.

30. Option D is correct. The first reaction of glycolysis that is conversion of glucose to glucose-6-phosphate requires energy and also known as energy investment phase. Hence the reaction is enfergonic.

31. Option B is correct. The NADH produced by glycolysis act as electron carrier goes to electron transport chain for the production of ATP via oxidative phosphorylation.

32. Option B is correct. Most of the energy produced by citric acid cycle is used to reduce electron carriers that is in the conversion of NAD+ to NADH whichb goes to ETC for the production of ATP.

33. Option D is correct. Both FADH2 and NADH gives electron to electron transport chain and converts into FAD+ and NAD+ respectively.

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

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