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- Question
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
- Correct Answer
- heme-protein
- 1. Ascorbic acid acts as an
Options- A. reducing agent
- B. oxidizing agent
- C. oxidizing and reducing agent both
- D. none of the above Discuss
- 2. The vitamin riboflavin, which occurs as a yellow pigment in egg yolk and milk become
Options- A. colorless on reduction with Zn in acid and regained its color on re-oxidation
- B. colorless on oxidation and regained its color on reduction with Zn in acid
- C. more deep in color on reduction with Zn in acid and regained its color on re-oxidation
- D. more deep in color on oxidation and regained its color on reduction with Zn in acid Discuss
- 3. Which of these molecules is vitamin H?
Options- A. Biotin
- B. Carnitine
- C. Folic acid
- D. None of these Discuss
- 4. An example of a digestive hormone is
Options- A. lipase
- B. pepsin
- C. amylase
- D. gastrin Discuss
- 5. Who discovered vitamin C (ascorbic acid)?
Options- A. Paul Berg
- B. Linus Pauling
- C. Albert Szent-Gyorgyi
- D. Kerry Mull is Discuss
- 6. What compound of raw egg white causes a syndrome similar to vitamin B deficiency?
Options- A. Avidin
- B. Betabindin
- C. Ovalbumin
- D. Albumin Discuss
- 7. Vitamin B12 (Cobalamin) is only synthesized by
Options- A. fishes
- B. micro-organisms
- C. plants
- D. animals Discuss
- 8. Lipoic acid exists in
Options- A. oxidized form
- B. reduced form
- C. oxidized and reduced form both
- D. none of these Discuss
- 9. 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
- 10. What metal ion is specifically bound by vitamin B12?
Options- A. Cobalt
- B. Copper
- C. Zinc
- D. Iron Discuss
Vitamins and Coenzymes problems
Search Results
Correct Answer: reducing agent
Correct Answer: colorless on reduction with Zn in acid and regained its color on re-oxidation
Correct Answer: Biotin
Correct Answer: gastrin
Correct Answer: Albert Szent-Gyorgyi
Correct Answer: Avidin
Correct Answer: micro-organisms
Correct Answer: oxidized and reduced form both
Correct Answer: B12(Co2+)to B12(Co+)
Correct Answer: Cobalt
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