Carbohydrate – Section 2

16. Which of the following does not occur during gluconeogenesis?

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

Correct Answer: B. The conversion of pyruvate to phosphoenolpyruvate (PEP)

17. Which of the following characteristic enzymes of gluconeogenesis is not found in the cytosol?

A. Pyruvate carboxlyase
B. Fructose-l,6-bisphosphatase
C. Both (a) and (b)
D. Glucose-6-phosphatase

Correct Answer: A. Pyruvate carboxlyase

18. The function of gluconeogenesis is

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

Correct Answer: D. all of the above

19. What is the consensus N-glycosylation site in a protein sequence?

A. Asn-Xaa-(Ser or Thr)
B. (Ser or Thr)-Asn-Ala
C. Thr-(Asn or Gln)-Ala
D. None of these

Correct Answer: A. Asn-Xaa-(Ser or Thr)

20. The process not involved in the formation of glucose by gluconeogenesis is

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

Correct Answer: A. the conversion of oxaloacetate to glucose

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