Amino acid metabolism: practice question

The best answer is B, Tyrosine. Tyrosine is converted through dopa intermediates to melanin in melanocytes, using the copper-containing enzyme tyrosinase.

Leucine is a branched-chain essential amino acid.

Glycine contributes to heme and purine synthesis.

Arginine is a precursor for nitric oxide and urea-cycle intermediates.

It tests Amino acid metabolism in Biochemistry. The correct option holds because: Correct: tyrosine provides the carbon skeleton for melanin.

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.