True or False: The class switch recombination of IgA antibodies is induced by TGF-beta or IL-21, and IgA antibodies can be transported across the placental interface as pentameric (5 member) oligomers. 4. A newborn infant has not started breastfeeding yet. Which isotype of maternal antibody/antibodies does the newborn have that they received from their mother while in utero?
1. True or False: Negative selection of transitional B cells in the spleen removes B cell clones whose BCR recognizes self antigens that weren't expressed in the bone marrow.
2. Which of the following statements about the pre-BCR is false?
A. Transiently expressed with the IgM isotype in its constant region.
B. Signals in an antigen-independent manner.
C. Consists of a rearranged immunoglobulin light chain paired with a surrogate immunoglobulin heavy chain (VpreB).
4. A newborn infant has not started breastfeeding yet. Which isotype of maternal antibody/antibodies does the newborn have that they received from their mother while in utero?
5. Which of the following statements about the enzyme activation-induced cytidine deaminase (AID) is true?
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