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  • Question
  • Which of these hormones is a catecholamine?


  • Options
  • A. Follitropin
  • B. Norepinephrine
  • C. Tetraiodothyronine
  • D. Tetrahydrofolate

  • Correct Answer
  • Norepinephrine 


  • Vitamins and Coenzymes problems


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    • 1. The symptoms of retinol excess are

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

    • Options
    • A. only microorganism
    • B. plant and microorganism
    • C. only plants
    • D. none of these
    • Discuss
    • 3. 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
    • 4. How many molecules of ATP are hydrolysed to form two molecule of ammonia?

    • Options
    • A. 10
    • B. 5
    • C. 16
    • D. 15
    • Discuss
    • 5. The inputs to one cycle of the urea cycle are

    • Options
    • A. 1 molecule of aspartic acid, 1 molecule of ammonia, 1 molecule of carbon dioxide, 3 molecules of ATP
    • B. 1 molecule of urea, 1 molecule of ammonia, 3 molecules of ATP and 1 molecule of fumaric acid
    • C. 1 molecule of fumaric acid, 1 molecule of urea, 3 molecules of AMP
    • D. None of the above
    • Discuss
    • 6. The vitamin niacin is part of the __________ molecule.

    • Options
    • A. ferredoxin
    • B. pyridoxal phosphate
    • C. pyrophosphate
    • D. NAD+
    • Discuss
    • 7. 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
    • 8. ?-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
    • 9. 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
    • 10. 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


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