Enaike ufuoma

Urea cycle

Questions
100
Time limit
45 min
Attempts
3
Avg score
1.0%
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Sample questions from this paper

The first 3 questions as they appear in the paper. Answers are shown only after you take it.

Q1
Which statement best summarises the relationship between the urea cycle and human survival?
  1. A It is a major pathway for converting toxic excess nitrogen into excretable urea
  2. B It is the principal pathway for oxygen transport
  3. C It is the only pathway that generates ATP in the liver
  4. D It is responsible for synthesising all plasma proteins
Q2
A patient with a urea-cycle disorder develops hyperammonemia after a severe infection. Which explanation is most appropriate?
  1. A Increased protein catabolism increases nitrogen delivery to an already impaired disposal pathway
  2. B Infection always blocks urea excretion by the kidneys
  3. C Ammonia is formed exclusively by bacterial action in the blood
  4. D All urea-cycle enzymes are destroyed during every infection
Q3
Which enzyme deficiency is expected to cause reduced production of citrulline from ornithine and carbamoyl phosphate?
  1. A Ornithine transcarbamylase deficiency
  2. B Arginase deficiency
  3. C Argininosuccinate lyase deficiency
  4. D Aspartate aminotransferase deficiency
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