1. Which of the following is true about the clonal selection theory? Select one: a. An antigen selects certain B cells to produce a clone of plasma cells b. An antibody stimulates the multiplication of B cell antigens against it c. T cells select those B cells that should produce antibodies regardless of antigens d. T cells suppress all those B cells except the ones that should divide and multiply e. An antibody selects certain B cells to produce a clone of plasma cells   2. All of the following are functions of the lymphatic system except it does not _(blank) _. Select one: a. Absorb excess fluid and return it to the bloodstream b. Absorb fats c. Produce lymphocytes d. Defend the body against pathogens e. Transport gases throughout the body   3. When a macrophage engulfs a pathogen, a piece of the pathogen is then presented on the macrophage's surface in the _ (blank) _ protein. Select one: a. Self-antigen complex b. Immunoglobulin complex c. Histamine complex d. Cell-mediated complex e. Major histocompatibility complex

Q: 21. The following is correct about superantigens? A. cause autoimmune disease C. activates B cells…

A: Introduction :- Superantigens (SAgs) are a group of antigens that cause the immune system to become…

Q: Identify the function of the Purkinje fibres. Select one: O a. O b. O c. O d. act as a pacemaker and…

A: The conducting system of heart consists of SA node, AV node, Right and left AV bundles, purkinje…

Q: Which of the following statements is INCORRECT regarding memory B cells? a. Memory B cells express…

A: B cells are a part of adaptive immune response. B cells have B cell receptors (BCRs) on their…

Q: 28. The molecules mediating signal transduction on a B-cell following antigen binding to BCR are…

A: B cell It is a type of lymphocyte which is involved in providing the humoral immunity component of…

Q: Which of the following is a characteristic of T cell receptors?

A: Only on the cell membrane are T-cell antigen receptors to be located. Because it is made up of two…

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: 10. NK cells recognize and kill abnormal host cells that are: A. opsonized with IgE. B. lacking…

A: According to bartleby expert guidelines, when multiple questions are posted we are allowed to answer…

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: 14. Predominant cell types involved in the humoral immune response are: A. eosinophils. В.…

A: Answer No 14 -- Humoral Immunity -- There are two types of immune responses             ( i )…

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: 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: Which of the following processes is not involved in central tolerance? Select one: A. Receptor…

A: Please follow step 2 for detailed explanation.

Q: Which of the following does not occur during a secondary immuneresponse?a. Antibodies are made…

A: Secondary Immune Response: Secondary Immune Response is one of the important features in which the…

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

A:

Q: The nucleus of B lymphocytes receives the signal indicating that the corresponding epitope was found…

A: The B lymphocyte (B cell) is indeed one of the body's most essential cells. By developing antibodies…

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

A: These are multiple choice questions.

Q: B Cells: O A. Are activated following antigen binding to their surface bound antibodies. O B. Each…

A: The immune system comprises various immune cells, complement systems, lymphatic systems, and…

Q: 6. Match the example/scenario provided to the type of humoral immunity. a. active, naturally…

A: The ability of the body to fight back any infection in the body comes from its immune system. The…

Q: 22. Which of the following is NOT a characteristic of cell- mediated immunity? The cells originate…

A: Note :- Since you have posted multiple questions, we will provide the solution only to the first…

Q: During the secondary immune response, in the serum you would expect a. to find a greater…

A: Introduction The secondary immune response occurs on repeated antigen exposures, with a stronger…

Q: 2) Hematopoietic stem cells give rise to: (Choose all that apply) а. B cells b. T cells Macrophages…

A: The stem cells that give rise to other blood cells are known as hematopoietic stem cells (HSCs).…

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: . 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: 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: In organ transplantation, minor histocompatibility antigens Select one: A. can trigger hyperacute…

A: Organ transplantation  Organ transplantation is a medical procedure in which the damage organ of the…

Q: Antibodies Select one: a. are not specific, but act generally. b. are composed of four light and…

A: The question is asking us to select the correct statement about antibodies. Antibodies, also known…

Q: The MHC structure is critical for... a. Natural Killer Cells to identify healthy cells b. T cells…

A: MHC is a protein that plays a crucial role in presenting the antigens and then clearing the antigens…

Q: Type I                                                             Type III…

A: 1) Sensitisation is an immunological reaction which occurs when any foreign body (bacteria/virus)…

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.