Amino acid metabolism: practice question

The best answer is B, Alanine. Muscle transfers amino nitrogen to pyruvate to form alanine, which carries nitrogen to liver for urea production in the glucose-alanine cycle.

Lysine is essential and ketogenic, not the main ammonia shuttle.

Leucine is a branched-chain amino acid used in muscle metabolism.

Phenylalanine is converted to tyrosine under normal metabolism.

It tests Amino acid metabolism in Biochemistry. The correct option holds because: Correct: alanine transports amino nitrogen from muscle to liver.

We tag it as an application question: it asks you to use a fact on a patient or a finding. The tag is our own editorial judgement, not an official difficulty rating, so read the reason for every option, not only the answer.

Build one table of enzyme deficiency, disease, inheritance and key finding, then revise it by spaced recall. Then use the flashcards and the other Biochemistry questions on this site to test what stuck.

No. It is an original practice item (editorial status: sample, version 1). NextPrep does not publish recalled or leaked questions, and independent faculty review of this item has not been completed yet, so confirm important facts in a standard textbook.