Which of the following statements regarding B cell development is correct? a- Functional mature b cells depend on the surface expression of surrogate light chain b- Mature b cells are absent in mice lacking activation induced cytidine deaminase 2- Which statement regarding T lymphocytes is false? a- MHC restriction by gamma delta T cells helps to prevent aberrant activation by self – antigens b- A TCR must be expressed on the surface of a thymocyte in order for positive selection to occur c- The thymus of MHC class II deficient mice contain CD4+ CD8+ T lymphocytes

Q: Which of the following statements about innate lymphoid cells is true? (ONE ANSWER)   Require the…

A: Innate lymphoid cells (ILCs) are immune cells that lack a specific antigen receptor but can produce…

Q: Match the appropriate term on the left with the appropriate definition of the right…

A: The immune system protects us from pathogenic infections.

Q: Compare and contrast the mechanisms of antigen challenge and the clonal selection processes of B and…

A: Immunity refers to the body's ability to guard against pathogenic microorganisms. It comprises a…

Q: Type II hypersensitivity reaction                                                  Type III…

A: Type IV hypersensitivity- Effector T cells specific for the sensitizing Ag Type II hypersensitivity…

Q: Which of the following is NOT a involved in the CD8-T-cell killing of viral-infected cells? Select…

A: In order to understand the role that CD8-T cells play in viral infections, it is important to first…

Q: Compare and contrast the process of antigen recognition in T cells and B

A: Immunity is the capability of multicellular organic entities to resist hurtful microorganisms.…

Q: How does a naïve B cell in the lymph node ‘see’ antigen, e.g. by itself or in association with cells…

A: Immunology is the branch of medical science that deals with the study of the immune system and…

Q: What is the activation signal for NK cells? How doesthis differ from the activity of T-cytotoxic…

A: Introduction: Natural killer cells are lymphocytes of the same family as T and B cells. They are…

Q: What will be the direct result of the interaction shown in this figure? CD4 TCR CD28 Epitope CD80…

A: The adaptive immune system is a specific defense mechanism that recognizes a foreign antigen or…

Q: 1. which antibody isotypes is in lowest concentration in serum? a- IGA b- IgD c-IgG d-IgE e-…

A:

Q: 1. These cells can release factors that can induce programmed death of a target cell, release…

A: Introduction: Immunity is referred to as the host's resistance against any foreign antigen,…

Q: What immune defense would be most impacted for a patient with a C9 complement protein deficiency? Be…

A: The complement system is a complex network of proteins that play a vital role in the immune…

Q: 1. In central tolerance, 3 mechanisms deviate B cells away from making autoreactive antibody. Which…

A: These are multiple choice questions.

Q: . Select the cell types that belong to the myeloid lineage. (more than one answer)  NK cells…

A: Immune system in the body consist of widely distrobuted cells which recognise foreign substances and…

Q: 1. Can create antibodies 2. Can destroy pathogens by secreting perforins 3. Is activated by a…

A: The humoral immune system deals with antigens from pathogens that are freely circulating, or outside…

Q: Immunology   1) What is the purpose of class I MHC molecules? What cells display these molecules?…

A: MHC stands for major histocompatibility complex, which is a group of genes that encode proteins…

Q: Match the antibody isotype with its functional characteristics. Highly effective at activating…

A: Answers  :  Highly active in activating complement :  Answers : -  IgM

Q: True or False: The class switch recombination of IgA antibodies is induced by TGF-beta or IL-21, and…

A: 3)It is a false statement.The IgA antibodies switching is done by T cell independent antigens and…

Q: explain in detail how a B cell gets activated (clonal selection and proliferation) How are T helper…

A: * Two types of immune response can be seen . They are primary response  Secondary response *…

Q: . True or False: Negative selection of transitional B cells in the spleen removes B cell clones…

A: Introduction :- During the selection of B-cells in the bone marrow , There are million of B-cells…

Q: What distinguishes MHC I from MHC II? a-aquisition of antigenic peptide in the cytoplasm…

A: MHC I and MHC II   Major histocompatibility complex Class I and Class II proteins help in providing…

Immunology

Immunology is the division of science involved with the immune reactions occurring in living organisms. The organisms are accustomed to evolving internal defense mechanisms to evade the invasion of microbial pathogens. Diverse cells are connected with stimulating the immune responses, which produce inhospitable conditions to the microbes prompting their lysis and thus inhibits the multiplication of the pathogens. The immune system can distinguish the pathogens through the aid of cellular intercommunication and launch responses to destroy them.