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Home Biochemistry Nitrogen Metabolism Comments

  • Question
  • Which of the following is used as carbon atom source while producing urea in the urea cycle?


  • Options
  • A. Arginine
  • B. Aspartic acid
  • C. Carbon dioxide
  • D. Glucose

  • Correct Answer
  • Carbon dioxide 


  • Nitrogen Metabolism problems


    Search Results


    • 1. Urea cycle converts

    • Options
    • A. ammonia into a less toxic form
    • B. ketoacids into amino acids
    • C. amino acids into ketoacids
    • D. none of these
    • Discuss
    • 2. The nitrogen atoms of urea produced in the urea cycle are derived from

    • Options
    • A. nitrate
    • B. ammonia and aspartic acid
    • C. nitrite
    • D. ammonia
    • Discuss
    • 3. Which of the following amino acid do not fall under the category of essential amino acid?

    • Options
    • A. Histidine
    • B. Leucine
    • C. Glycine
    • D. Methionine
    • Discuss
    • 4. Which of the following is not a significant biological oxidizing agent?

    • Options
    • A. FAD
    • B. Fe3+
    • C. O2
    • D. NAD+
    • Discuss
    • 5. What happens after glycolysis when oxygen is available as an electron acceptor?

    • Options
    • A. Pyruvate is formed
    • B. NADH is produced
    • C. Fermentation
    • D. Oxidative phosphorylation
    • Discuss
    • 6. 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
    • 7. How many molecules of ATP are hydrolysed to form two molecule of ammonia?

    • Options
    • A. 10
    • B. 5
    • C. 16
    • D. 15
    • Discuss
    • 8. 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
    • 9. Nitrate reduction can be carried out by

    • Options
    • A. only microorganism
    • B. plant and microorganism
    • C. only plants
    • D. none of these
    • Discuss
    • 10. The symptoms of retinol excess are

    • Options
    • A. bone fragility
    • B. nausea
    • C. weakness
    • D. all of these
    • Discuss


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