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Retired NBME 23 Answers

nbme23/Block 4/Question#42 (reveal difficulty score)
A 12-year-old girl is admitted to the ...
Methionine ๐Ÿ” / ๐Ÿ“บ / ๐ŸŒณ / ๐Ÿ“–
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 +14  upvote downvote
submitted by โˆ—sympathetikey(1600)
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Classic homocystinuria.

See this pic of the section for it in FA 2019 - https://serving.photos.photobox.com/78796525c8643c0eceea53592c7d63f81a0642564e58c186ae2b83438c7bf2bf16672796.jpg

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 +0  upvote downvote
submitted by โˆ—weirdmed51(30)
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Homocystinuria can be due to cystathionine synthase or methionine synthase defc.

  • cystathionine synthase defc: (more comm.) increased methionine and decreased cystathionine and cysteine...Cysteine becomes essential.
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