Memory T cells _____. (Select all that apply.) a. must all be activated in secondary lymphoid organs b. do not require co-stimulation through CD28 c. are composed only of CD4 T cells d. do not undergo somatic hypermutation e. are usually short-lived f. do not undergo isotype switching.

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 term with its correct description Long, flexible molecule expressed on B-cells,…

A: B cells These are lymphocytes that are involved in the humoral immunity constituent of the adaptive…

Q: What molecule ensures that T-lymphocytes which encounter their antigen in the lymph node stay there…

A: T cell is a type of lymphocyte.T cells are one of the important white blood cells of the immune…

Q: All of the following have been observed in individuals deficient in either CD3δ or CD3ε except a.…

A: Answer: Introduction: CD3 means a cluster of differentiation is a complex of proteins and T- cell…

Q: 29. T-cell dependent antigens can a. directly stimulate B cells to multiply and produce antibodies…

A: The correct answer is (c) restrict antibody formation. T-cell dependent antigens require the help of…

Q: 16. Expression of CD25 and CTLA-4 is a characteristic of? A. TH1 B. TH2 Treg

A: CD25 is a protein marker for CD4+ thymocytes. It hs actually the α-chain of the IL-2 receptor. CTLA4…

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: D. TH17 17. Down regulation of ..............allow naïve T cells to enter lymph nodes? B. B7 C.…

A: T cells These are white blood cells that belong to the adaptive immune system. These cells play a…

Q: An adult who has been thymectomized will have a T-cell repertoire that _____. a. resembles a…

A: The answer is described in the next step:-

Q: Where do naïve cytotoxic T cells encounter foreign antigens and become activated cytotoxic T cells?…

A: Naive t- cells are basically T- lymphocytes that have never been exposed to antigens since their…

Q: A single antigen molecule contains multiple ________

A: The antigens are molecules/proteins that are present on the surface of a micro-organism. Certain…

Q: _______ involves successive rearrangement at the lightchain loci when reactivity to self antigen…

A: Answer is a.) Receptor Editing.

Q: Dysfunctional repair of DNA double strand breaks often results in SCID because: thoose all that…

A: SCID stands for severe combined immunodeficiency disease.SCID is caused by adenosine deaminase (ADA)…

Q: A metabolically stressed epithelial cell expresses the protein MICits surface and then interacts…

A: NK cells are activated as an early event during an immune response and does not require the need for…

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

A:

Q: Which of the following statements about Notch 1 is correct? (Select all that apply.) Select one or…

A: Concept used :  Notch 1 gene    Definitions required -  Notch 1 gene :  Notch one is a gene that…

Q: Match the stage of B cell development with the rearrangement or expression of immunoglobulin genes.…

A: B cell development begins in the fetal liver and continues in the bone marrow throughout our lives.…

Q: A drug that were to inhibit the activity of T suppressor cells would lead to _______. a.…

A: Regulatory T cells (Tregs) also known as supressor t cell are a specialized subpopulation of T cells…

Q: CD8 T cells in a culture are analyzed for their ability to produce the cytokine IFN-g, and the…

A: T cells are the essential component of immune system. These are developed in the bone marrow and…

Q: Hyperacute graft rejection is caused by Select one: A. hyperactivated helper T cells. B.…

A: Its a type of transplant rejection which occurs within minutes of organ transplant. Pre existing…

Q: Amino acid variation among MHC class II allotypes that present antigens to CD4 T cells is…

A: MHC or major histocompatibility complex is a set of genes. These genes are responsible for the…

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: Helper T cells do not _________. Select one: a. secrete cytokines that stimulate clonal selection…

A: The question is asking us to identify the function that Helper T cells do not perform.

Q: How may B cells be activated? Select all that apply. Select one or more: a. Crosslinking of BCRS and…

A: How may B cells be activated?

Q: 13. As a response to viral-infected cells, the following cell gets activated? A. TH1 B. TH2 C. TH3…

A: Introduction  A host is required for the growth of viruses, which are microscopic infectious…

Q: If a T-cell receptor on a double-positive thymocyte binds to a self-peptide:self-MHC class I complex…

A: The immune system is the shield of the body that protects it from outside intruders, like…

Defense Mechanism

Circumstances influence and compel people to behave in a certain way. One such behavior is a defense mechanism. It is employed by people to escape from unpleasant circumstances, thoughts and actions. Defense mechanisms are, thus, psychological strategies that help to avert and avoid unwanted feelings such as guilt or shame and situations such as threat and danger.