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Home Biochemistry Vitamins and Coenzymes Comments

  • Question
  • The vitamin niacin is part of the __________ molecule.


  • Options
  • A. ferredoxin
  • B. pyridoxal phosphate
  • C. pyrophosphate
  • D. NAD+

  • Correct Answer
  • NAD+ 


  • Vitamins and Coenzymes problems


    Search Results


    • 1. Which of these hormones is a catecholamine?

    • Options
    • A. Follitropin
    • B. Norepinephrine
    • C. Tetraiodothyronine
    • D. Tetrahydrofolate
    • Discuss
    • 2. The symptoms of retinol excess are

    • Options
    • A. bone fragility
    • B. nausea
    • C. weakness
    • D. all of these
    • Discuss
    • 3. Nitrate reduction can be carried out by

    • Options
    • A. only microorganism
    • B. plant and microorganism
    • C. only plants
    • D. none of these
    • Discuss
    • 4. The products of urea cycle are

    • Options
    • A. 1 molecule of urea, 1 molecule of ammonia, 1 molecule of ATP and 1 molecule of fumaric acid
    • B. 1 molecule of fumaric acid, 1 molecule of urea, 1 molecule of AMP, 2 molecules of ADP
    • C. 1 molecule of aspartic acid, 1 molecule of ammonia, 1 molecule of fumaric acid, 1 molecule of ATP
    • D. None of the above
    • Discuss
    • 5. How many molecules of ATP are hydrolysed to form two molecule of ammonia?

    • Options
    • A. 10
    • B. 5
    • C. 16
    • D. 15
    • Discuss
    • 6. Vitamins are essential because the organism

    • Options
    • A. can't synthesize these compounds at all
    • B. can synthesize these compounds partially
    • C. can't synthesize these compounds in the adequate amounts
    • D. none of the above
    • Discuss
    • 7. ?-carotene together with ?-carotene, ?-carotene and cryptoxanthine are synthesized by

    • Options
    • A. plants
    • B. animal
    • C. plants and animals both
    • D. none of these
    • Discuss
    • 8. Selenium is an essential component of the enzyme glutathione peroxidase which

    • Options
    • A. scavenges toxic hydoperoxycompounds in tissues
    • B. reduces toxic hydoperoxycompounds in tissues
    • C. oxidizes toxic hydoperoxycompounds in tissues
    • D. none of the above
    • Discuss
    • 9. In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine.

    • Options
    • A. adenine
    • B. 5-6 dimethylbenzimidazole
    • C. hydroxycobalamin
    • D. cyanocobalamin
    • Discuss
    • 10. Acyl carrier protein (ACP) plays an important role in the biosynthesis of

    • Options
    • A. fatty acids
    • B. amino acids
    • C. sugars
    • D. carbohydrates
    • Discuss


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