Which of the following best describes the B-cell receptor (BCR) expressed on naïve B cells?

The following cells participate most directly in adaptive cell-mediated immunity.

Which of the following is a host structure that recognizes microbial structures?

Which of the following body sites is considered sterile?

A laboratory report identifies the first antibody produced after a patient develops an acute bacterial infection. Which antibody is most likely detected?

Which complement regulatory protein specifically prevents formation of the membrane attack complex?

Case A 6-month-old infant has recurrent skin infections caused by Staphylococcus aureus. Laboratory results show a normal neutrophil count, but the neutrophils cannot leave the bloodstream.          Which defect best explains this patient’s condition?

Which type of interferon is primarily involved in adaptive immunity?

How does a lack of CD40 ligand on T cells affect a person’s immune response?

A newly discovered antibiotic kills bacteria by creating channels in the cytoplasmic membrane that allow ions to leak out of the cell. Which existing antibiotic has the same mechanism of action?