#may2020mccqe1
A mother brings her 5-year-old son to his pediatrician’s office. The boy has been experiencing frequent falls as well as progressive difflculty with walking, jumping, and hopping. Laboratory testing reveals a creatine kinase level of 2840 U/L. Muscle biopsy reveals variation in fiber diameter, an increased number of internalized nuclei, and muscle fiber degeneration and regeneration. Western blot analysis will most likely reveal the complete absence of which of the following?
(A) Cystic fibrosis transmembrane conductance regulator
(B) Dystrophin
(C) Phenylalanine hydroxylase
(D) Spectrin
(E) Type II collage
A mother brings her 5-year-old son to his pediatrician’s office. The boy has been experiencing frequent falls as well as progressive difflculty with walking, jumping, and hopping. Laboratory testing reveals a creatine kinase level of 2840 U/L. Muscle biopsy reveals variation in fiber diameter, an increased number of internalized nuclei, and muscle fiber degeneration and regeneration. Western blot analysis will most likely reveal the complete absence of which of the following?
(A) Cystic fibrosis transmembrane conductance regulator
(B) Dystrophin
(C) Phenylalanine hydroxylase
(D) Spectrin
(E) Type II collage
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