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Biochemistry, cell biology, and genetics

Michaelis-Menten Calculations and Graphs | USMLE Step 1

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SAMPLE QUESTION

A 29-year-old woman has fatigue, early satiety, and intermittent bone pain. Her hemoglobin is 10.2 g/dL and platelet count is 74,000/mm³. Imaging shows hepatosplenomegaly, and leukocyte testing demonstrates markedly reduced glucocerebrosidase activity. After 6 months of imiglucerase treatment, her hemoglobin and platelet count rise and her spleen volume decreases.

Which change in macrophages most directly accounts for this response?