MIMG 185A Final Exam 2026/2027 | 12 Immunology Questions & Answers | B & T Cells, Isotype Switching, BCR, TCR, MHC & Complement | UCLA

This concise MIMG 185A Final Exam 2026/2027 study resource contains 12 immunology terms and verified answer explanations focused on the molecular mechanisms controlling B-cell and T-cell development, antibody production, antigen-receptor signaling and immunoglobulin isotype switching. The two-page document reviews B7, IL-4, AID, RAG, C3, CD28, Igβ, FcγRIIB, Class I MHC, CD3 and B220, with each answer explaining the molecule’s immunological function or its relationship to lymphocyte development and antibody responses. A central theme is T-cell co-stimulation and its relationship to B-cell antibody responses. The material connects B7 and CD28 with the co-stimulatory signal required for appropriate T-cell activation and CD40L expression. It specifically links the absence of co-stimulation with failure to generate the CD40L-dependent signaling needed for immunoglobulin isotype switching. This makes the document useful for reviewing how interactions between T and B lymphocytes influence antibody class switching. The document also concentrates on the molecular genetics of antibody diversification and isotype switching. IL-4 is identified as necessary for initiating transcription associated with switching toward IgE, while activation-induced cytidine deaminase (AID) is described as necessary for isotype switching and participating in the DNA-level process. RAG proteins are distinguished from AID by their role in VJ and VDJ assembly, which is required to construct functional antigen-receptor variable regions. These distinctions are particularly valuable for examination questions asking students to separate mechanisms of initial antigen-receptor generation from later antibody class switching. Additional material reviews important B-cell receptor and developmental markers. Igβ is identified as part of the B-cell receptor complex and necessary for normal B-cell development, while B220 is presented as a B-cell marker. The document also identifies a pre-B-cell receptor component whose expression is required for B-cell development. Together, these entries provide targeted review of the molecules used to distinguish stages and functions of developing B lymphocytes. The final concepts differentiate immune molecules that are important to immunity but are not directly required for antibody isotype switching. C3 is described as a central component of the complement cascade necessary for a robust immune response but not required for antibody production. FcγRIIB is characterized as an inhibitory receptor that modulates cellular responses without directly controlling isotype switching. Class I MHC is associated with antigen presentation to cytotoxic T lymphocytes rather than B lymphocytes, while CD3 is identified as a component of the T-cell receptor complex. Referenced Academic Source: The uploaded document does not contain a bibliography, textbook title, journal article or formal reference list. Its content is specifically labeled MIMG 185A Final 2026/2027 and covers advanced immunology concepts involving adaptive immunity, lymphocyte receptors and antibody responses. The course code MIMG 185A is associated with Microbiology, Immunology, and Molecular Genetics at UCLA, but the uploaded file itself does not explicitly print the university name; therefore, UCLA should be treated as course-code attribution rather than a university affiliation stated directly in the document. Relevant Students: MIMG 185A students, UCLA microbiology and immunology students, immunology students, molecular genetics students, microbiology students, life sciences students, pre-medical students studying immunology, students reviewing adaptive immunity, and learners preparing for examinations on B-cell development, T-cell activation, antibody diversification and immunoglobulin class switching. Keywords: MIMG 185A Final Exam 2026, MIMG 185A Final Exam 2027, MIMG 185A questions and answers, MIMG 185A study guide, immunology final exam, immunology questions and answers, B cell development, T cell activation, B cell receptor, BCR, T cell receptor, TCR, antibody production, antibody isotype switching, immunoglobulin class switching, B7 CD28 costimulation, CD40L, IL-4 immunology, IgE class switching, activation induced cytidine deaminase, AID immunology, RAG proteins, VDJ recombination, VJ recombination, complement C3, pre-B cell receptor, Ig beta, Fc gamma RIIB, Class I MHC, cytotoxic T lymphocytes, CD3 TCR complex, B220 B cell marker, adaptive immunity, lymphocyte development, antibody diversification, UCLA MIMG 185A