Discussion
Home ‣ Biochemistry ‣ Vitamins and Coenzymes Comments
- Question
What metal ion is specifically bound by vitamin B12?
Options- A. Cobalt
- B. Copper
- C. Zinc
- D. Iron
- Correct Answer
- Cobalt
- 1. The reductant, NADH, transfers the electrons via a flavo-proteins to the specific disulfide (S-S) protein to form a dithiol (SH,SH) protein which converts vitamin
Options- A. B12(Co2+)to B12(Co)
- B. B12(Co) to B12(Co2+)
- C. B12(Co2+)to B12(Co+)
- D. B12(Co+)to B12(Co2+) Discuss
- 2. Lipoic acid exists in
Options- A. oxidized form
- B. reduced form
- C. oxidized and reduced form both
- D. none of these Discuss
- 3. Vitamin B12 (Cobalamin) is only synthesized by
Options- A. fishes
- B. micro-organisms
- C. plants
- D. animals Discuss
- 4. What compound of raw egg white causes a syndrome similar to vitamin B deficiency?
Options- A. Avidin
- B. Betabindin
- C. Ovalbumin
- D. Albumin Discuss
- 5. In one iron-metalloflavoprotein, the iron is present as a
Options- A. heme-protein
- B. nonheme type
- C. both (a) and (b)
- D. flavin moiety Discuss
- 6. Vitamin-C is considered as a
Options- A. water soluble
- B. fat soluble
- C. fat and water soluble
- D. none of these Discuss
- 7. Main function of insulin hormone is to
Options- A. increase glycogen in liver
- B. decrease glycogen in liver
- C. increase blood sugar
- D. decrease blood sugar Discuss
- 8. In the equation, A = ? bc, what quantity is represented by "?"?
Options- A. Absorbtivity
- B. Molar absorbtivity
- C. Path length
- D. None of these Discuss
- 9. Why are rotational transitions of little use to a spectroscopist?
Options- A. Because the energy required to induce a rotational transition is so small that it cannot be measured
- B. Because rotational transitions are extremely rare
- C. Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
- D. All of the above Discuss
- 10. Why is it generally preferable to use absorbance as a measure of absorption rather than % transmittance?
Options- A. Because %T cannot be measured as accurately as absorbance
- B. Because %T is dependant on the power of the incident radiation
- C. Because absorbance is proportional to the concentration of the analyte, whereas %T is not
- D. none of the above Discuss
Vitamins and Coenzymes problems
Search Results
Correct Answer: B12(Co2+)to B12(Co+)
Correct Answer: oxidized and reduced form both
Correct Answer: micro-organisms
Correct Answer: Avidin
Correct Answer: heme-protein
Correct Answer: water soluble
Correct Answer: decrease blood sugar
Correct Answer: Molar absorbtivity
Correct Answer: Because, in liquids and solids, spectral lines corresponding to rotational transitions are broadened as the result of molecular collisions and other interactions
Correct Answer: Because absorbance is proportional to the concentration of the analyte, whereas %T is not
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