QCM : Fundamentals of Immunology — 10 questions

Explication

'Immune system organization' refers to how the immune system is structured into two main components: innate immunity, which provides immediate, non-specific defense, and adaptive immunity, which offers specific, memory-based responses. This classification is fundamental to understanding immune responses.

Explication

Edward Jenner is credited with developing the first successful smallpox vaccine in 1796 using cowpox material, establishing the foundation for immunology and vaccination science.

Explication

Pathogen recognition's main function is to detect invading microbes and trigger immune responses that lead to their elimination, making option 0 the correct choice.

Explication

The first publication describing Toll-like receptors (TLRs) in mammals was in 1997, marking a significant milestone in understanding innate immunity. The discovery in Drosophila occurred earlier, but the mammalian TLRs were identified and characterized around 1997.

Explication

B cells recognize intact, native antigens via surface immunoglobulins, enabling humoral responses. T cells, on the other hand, recognize processed peptide fragments presented by MHC molecules on antigen-presenting cells, which is essential for cellular immunity. This fundamental difference in recognition mechanisms distinguishes their roles in adaptive immunity.

Explication

Louis Pasteur is credited with pioneering work in microbiology and immunology, which laid the foundation for understanding how cells respond to pathogens, a process involving cell signaling mechanisms.

Explication

The primary cause of lymphocyte development is the genetic recombination of receptor genes (V(D)J recombination) that occurs during maturation in the bone marrow and thymus, enabling the production of diverse antigen receptors necessary for adaptive immunity.

Explication

Using cytokines to increase the expression of MHC molecules on antigen-presenting cells enhances the presentation of pathogen-derived peptides, thereby improving T cell recognition and activation. Introducing synthetic peptides alone does not ensure proper presentation unless they are loaded onto MHC molecules, which requires antigen-presenting cells. Blocking MHC expression would inhibit T cell recognition, and adding free antibodies against TCRs would not stimulate T cells effectively; instead, it could block recognition or cause non-specific effects.

Explication

Edward Jenner's groundbreaking discovery involved using material from cowpox lesions to induce immunity against smallpox. The cowpox virus, a related but less virulent virus, was the key component that provided cross-protection, leading to the development of the first successful vaccine.

Explication

ELISA (Enzyme-Linked Immunosorbent Assay) is a laboratory technique used to detect and measure specific antigens or antibodies in a sample through enzyme-linked detection, providing qualitative or quantitative results.