What this page covers
Practice Step 1-style biochemistry questions on Folate trap mechanism in vitamin B12 deficiency (methionine synthase), including Anemia improved with folic acid but new progressive neurological findings, with emphasis on clinical behavior / downstream consequence and answer-choice reasoning.
How to use this page
Review the topic and reasoning focus, then practice Step 1-style questions inside BiochemStep. The question set emphasizes mechanism-first answer-choice reasoning rather than passive content review.