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Review Question - QID 214353

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QID 214353 (Type "214353" in App Search)
A 5-month-old boy is brought to a pediatrician for evaluation after he was adopted from abroad. He has no past medical records, and on presentation he appears very small, measuring less than the 3rd percentile in height, weight, and head circumference. On physical exam, he is found to have coarse facial features and hepatosplenomegaly. He is also found to have very stiff joints and bowed legs. Serum studies reveal elevated levels of glucosidases, sulfatases, and proteases. Which of the following organelles is responsible for the biochemical transformation that is most likely abnormal in this patient?