Q67. (BONUS QUESTION 02) A 3-year-old boy is brought to the…

Q67. (BONUS QUESTION 02) A 3-year-old boy is brought to the pediatrician due to recurrent respiratory infections and chronic diarrhea. His parents report he has had multiple episodes of pneumonia and otitis media since infancy. Physical exam reveals enlarged tonsils and cervical lymphadenopathy. Labs show: IgM: 850 mg/dL (rr: 40-230 mg/dL), IgG:

Q61. A researcher is studying antibody diversity developing…

Q61. A researcher is studying antibody diversity developing in B cells. They observe that during V(D)J recombination, the enzyme terminal deoxynucleotidyl transferase (TdT) adds non-templated nucleotides at the junctions between gene segments. In which region of the antibody heavy chain is this junctional diversity most likely to directly affect the amino acid sequence?

The nurse is evaluating a patient with muscle weakness who r…

The nurse is evaluating a patient with muscle weakness who received edrophonium, also known as the tensilon test.  After injection, the patient shows improved muscle strength.  The nurse knows this response of improved muscle strength to edrophonium is consistent with which of the following diseases?