Carbohydrate problems
- 1. Which of the following does not occur during gluconeogenesis?
Options- A. The carboxylation of pyruvate to oxaloacetate
- B. The conversion of pyruvate to phosphoenolpyruvate (PEP)
- C. The decarboxylation of oxaloacetate to phosphoenolpyruvate
- D. The conversion of PEP to fructose bisphosphate Discuss
Correct Answer: The conversion of pyruvate to phosphoenolpyruvate (PEP)
- 2. The function of gluconeogenesis is
Options- A. maintenance of blood glucose levels during starvation or a low carbohydrate diet
- B. recovery of lactate from fermentation and glycerol from fat breakdown
- C. a pathway for the utilization of amino acids
- D. all of the above Discuss
Correct Answer: all of the above
- 3. In the Glycolysis reaction, for each glucose conversion how many ATP's are produced?
Options- A. 4
- B. 2
- C. 1
- D. 3 Discuss
Correct Answer: 2
- 4. What is the cause of the genetic disease known as Galactosemia?
Options- A. Deficiency in lactase
- B. Absence of galactose 1-P uridyl transferase
- C. Absence of lactose synthetase
- D. Non functioning of semnase Discuss
Correct Answer: Absence of galactose 1-P uridyl transferase
- 5. Fructose diphosphate accumulation would
Options- A. inhibit glycolysis and gluconeogenesis
- B. stimulate glycolysis and gluconeogenesis
- C. stimulate glycolysis and inhibit gluconeogenesis
- D. inhibit glycolysis and stimulate gluconeogenesis Discuss
Correct Answer: stimulate glycolysis and inhibit gluconeogenesis
- 6. Glycolysis reactions take place in
Options- A. cytoplasm
- B. cell membrane
- C. cell wall
- D. plasmids Discuss
Correct Answer: cytoplasm
- 7. When living organisms are cooled below some critical body temperature, the metabolic reactions within their cells cease to function properly. This malfunction occurs because
Options- A. their enzymes lose the proper three-dimensional shape
- B. enzyme active sites become permanently bound to substrates
- C. the activation energy for the reaction is raised
- D. there is insufficient molecular motion for substrates to interact Discuss
Correct Answer: there is insufficient molecular motion for substrates to interact
- 8. Each reaction in a metabolic pathway is
Options- A. reversible
- B. irreversible
- C. catalyzed by a specific enzyme
- D. controlled by the end product Discuss
Correct Answer: catalyzed by a specific enzyme
- 9. Which of the following enzymes plays an important role in the Cori " cycle?
Options- A. Glucokinase
- B. Glucose-6-phosphate dehydrogenase
- C. Lactate dehydrogenase
- D. Glucose isomerase Discuss
Correct Answer: Lactate dehydrogenase
- 10. The process not involved in the formation of glucose by gluconeo-genesis is
Options- A. the conversion of oxaloacetate to glucose
- B. the conversion of lactate to pyruvate
- C. the dephosphorylation of glucose-6-phosphate
- D. all of the above Discuss
Correct Answer: the conversion of oxaloacetate to glucose
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