What this page covers
Practice Step 1-style biochemistry questions on RT-qPCR / gene expression quantification / beta-thalassemia, including Infant, Mediterranean ancestry, severe microcytic anemia, absent HbA, biallelic HBB variants, with emphasis on enzyme / mechanism 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.