41. Which of the following statements about cellular respiration is false? a) Th

Question

41. Which of the following statements about cellular respiration is false? a) Three CO2 will be given off during the reactions of the Krebs cycle for every b) Two pyruvate molecules are generated for every glucose molecule that begins c) Four ATP (two net) are generated for every slucose molecule that begins the d) One NAD+ is generated for every pyruvate molecule that is subjected to e) None of the above acetyl-CoA molecule that joins with oxaloacetate to form citric acid. the reactions of glycolysis. reactions of glycolysis fermentation. 42. Substrate level phosphorylation: a) Uses an inorganic phosphate group to phosphorylate ADP b) Occurs as a result of electron passage along the e.t.c. in mitochondria. c) Is carried out by ATP synthases when the H+ gradient isn't strong enough. d) Occurs when the ATP synthases operate in reverse. e) None of the above. 43. Pepsin is a digestive enzyme active in the stomach. As food moves from the stomach to the small intestine, pepsin moves with it, though it ceases to function once it is in the intestine. Which of the following is the best possible explanation of this phenomenon? a) b) c) d) There is a greater concentration of different enzymes in the intestine which outcompete the pepsin enzyme. Pepsin is not very efficient at digesting proteins and the body turns it off as soon better enzymes become available. The enzymes that digest proteins in the small intestine are non-competitive inhibitors of pepsin. The environmental conditions of the small intestine change the shape of pepsin. Pepsin can't find its substrates in the small intestine. e) 44. Which of the following is false regarding a protein that functions in the nucleus? a) This protein did not enter the Golgi apparatus for processing b) This protein at one point contained a stretch of hydrophobic amino acids known as the signal sequence at its N-terminus. c) Translation of this protein was initiated by a free ribosome. d) This protein contains an amino acid sequence that directs it to the nucleus. e) None of the above 13

Explanation / Answer

41. A, No 4 Co2 molecules are formed in each Krebs cycle.

42.A, as In this ATP is produced by transfer of phosphate group from a substrate to ADP.

43. D Pepsin needs an acidic environment for activation and acidic PH for optimum function, which is present in the stomach but not in the intestine. The intestine has a basic environment as pepsin moves from the stomach to the intestine it loses acidic environment and becomes inactive.

44. A, don't enter into Golgi apparatus as they don't need to be processed for transportation.

Related Questions

Navigate

• Browse (All)
• Browse 4
• Subjects

---

---

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