All of the following are excreted in cystinuria, except:
Correct Answer: Leucine
Description: Ans. b. LeucineRef: Harpers 30th Ed, Page No- 302Cystine, lysine, arginine, and ornithine are excreted in cystine-lysinuria (cystinuria), a defect in renal reabsorption of these amino acids.Apart from cystine calculi, cystinuria is benign. The mixed disulfide of 1-cysteine and 1-homocysteine excreted by cystinuric patients is more soluble than cystine and reduces formation of cystine calculi.Several metabolic defects result in vitamin B6-responsive or vitamin B6-unresponsive homocystinurias. These include a deficiency in the reaction catalyzed by cystathionine b-synthase;Serine+homocysteine-cystathionine +H2 O
Category:
Biochemistry
Get More
Subject Mock Tests
Practice with over 200,000 questions from various medical subjects and improve your knowledge.
Attempt a mock test nowMock Exam
Take an exam with 100 random questions selected from all subjects to test your knowledge.
Coming SoonGet More
Subject Mock Tests
Try practicing mock tests with over 200,000 questions from various medical subjects.
Attempt a mock test now