Carbohydrate problems
- 1. The hormones, glucagon and epinephrine, stimulate glycogen breakdown to G-6-P
Options- A. only in the liver
- B. using ATP as the phosphoryl donor
- C. directly, by binding to glycogen phosphorylase
- D. indirectly, by first stimulating adenylate cyclase to make cAMP Discuss
Correct Answer: indirectly, by first stimulating adenylate cyclase to make cAMP
- 2. Regulated metabolic pathways are
Options- A. compartmentalized in eukaryotes
- B. usually regulated at the first step
- C. committed after the first step
- D. all of these Discuss
Correct Answer: all of these
- 3. Which of the following characteristic enzymes of gluconeogensis is not found in the cytosol?
Options- A. Pyruvate carboxlyase
- B. Fructose-l,6-bisphosphatase
- C. Both (a) and (b)
- D. Glucose-6-phosphatase Discuss
Correct Answer: Pyruvate carboxlyase
- 4. Metabolic reactions that break down complex molecules into smaller compounds, thereby releasing usable energy for the cell, are best described as
Options- A. biosynthetic
- B. catabolic
- C. catalytic
- D. photosynthetic Discuss
Correct Answer: catabolic
- 5. What would be the molecular formula for a polymer made by linking ten glucose molecules together by dehydration synthesis, if molecular formula for glucose is C6H,206?
Options- A. C60H100O50
- B. C60H120O60
- C. C60H102O51
- D. (C6H12O6)10 Discuss
Correct Answer: C60H102O51
- 6. An intermediate which inhibits the activity of fructose 1,6 diphos-phatase would inhibit
Options- A. glycolysis
- B. pyrolysis
- C. gluconeogenesis
- D. none of these Discuss
Correct Answer: gluconeogenesis
- 7. What is the consensus N-glycosylation site in a protein sequence?
Options- A. Asn-Xaa-(Ser or Thr)
- B. (Ser or Thr)-Asn-Ala
- C. Thr-(Asn or Gln)-Ala
- D. None of these Discuss
Correct Answer: Asn-Xaa-(Ser or Thr)
- 8. Patients suffering from Von Gierke's disease are unable to perform gluconeogeneis because they have a defective
Options- A. lactate dehydrogenase
- B. glucose 6 phosphatase
- C. pyruvate carboxylase
- D. none of these Discuss
Correct Answer: glucose 6 phosphatase
- 9. The multistep pathways of metabolism are efficient because they
Options- A. locate all of the enzymes for a pathway in the same place within the cell
- B. use the same substrate for all of the enzymes in the pathway
- C. use the same enzyme for all of the substrates in the pathway
- D. spread the enzymes for a pathway into several different organelles Discuss
Correct Answer: locate all of the enzymes for a pathway in the same place within the cell
- 10. Aldolases splits fructose 1,6 biphosphate into
Options- A. glyceraldehyde 3- phosphate
- B. glyceraldehyde 3- phosphate and dihydroxyacetone phosphate
- C. dihydroxyacetone phosphate
- D. none of the above Discuss
Correct Answer: glyceraldehyde 3- phosphate and dihydroxyacetone phosphate
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