A macrophage phagocytizes an invading E. coli bacterium.  Select the type of MHC molecule that presents antigen to the correct T cell subset. A. MHC I, cytotoxic T cell  B. MHC II, T helper cell  C. MHC I, T helper cell  D. MHC II, cytotoxic T cell

Q: Which of the following statements about T cells is false? a. Helper T cells release cytokines while…

A: Immunity is the capability of multicellular organisms to resist the attack of harmful…

Q: Explain why each choice (a-d) is correct or incorrect. In clonal selection of B cells, which…

A: B cell expresses receptors ,that are specific to distinct antigen,  is determined before…

Q: Which of the following pairs is mismatched? a. activation of memory cells: secondary immune…

A: Explanation given for the mismatch pair.

Q: Which of the following is part of the second line of defense against pathogens? a. skin b. mucus…

A: The immune system is made up of special organs, cells and chemicals that fight infection (microbes).…

Q: For question with blanks, choose the combination of answers that most accurately completes the…

A: Introduction  Our immune system plays key role in defence against harmful foreign particles be it…

Q: Which type of cell actually secretes antibodies?a. T cell b. macrophage c. plasma cell d. monocyte

A: B-cells, also said to be B lymphocytes, are a type of white blood cells that play a crucial role in…

Q: Ibuprofen dampens the immune system’s inflammation response.What might be a short-term consequence…

A: Ibuprofen is a type of NSAID, which is used for treating inflammation, fever, pain... It basically…

Q: What does the T-cell receptor on the helper T cell bind? free antigen in soluble form b. antigens…

A:

Q: Which of the following cells is critically important in mounting an adaptive immune response?

A: Adaptive immune response is the response that is acquired by the body after exposure to a disease…

Q: An antigen-presenting cell (APC)a. presents antigens to T cells.b. secretes antibodies.c. marks each…

A: Helper T-cells activate B-cells in order to generate antibodies and aid the production of killer…

Q: Which innate immune system component uses MHC class I molecules directly in its defense strategy? a.…

A: Innate immune system:                 The first line of defense that castles border for pathogen…

Q: Natural killer cellsa. are known for attacking large parasites, such as tapeworms.b. engulf…

A: Natural Killer cells also called large granular lymphocytes are a type of white blood cell. It is a…

Q: B cells that produce and release large amounts of antibody are called: a. Memory cells b.…

A: B lymphocytes are thymus-independent cells that express immunoglobulins (see below) on their…

Q: Molecules that label your cells as “self” area. antibodies.b. T-cell receptors.c. major…

A: The immune system of a healthy individual possess an ability to differentiate between the self cells…

Q: Name the 3 major sub-types of T-lymphocytes: a. (a) ___________________ (b) ___________________ (c)…

A:

Q: DiGeorge syndrome is a congenital disease that results in a poorly developed, nonfunctioning thymus…

A: Primary immunodeficiency are the immunodeficiency diseases which arises from the birth where as…

Q: Which of the following links the Innate immune system to the adaptive? a. Cytokines b. APC cells c.…

A: INTRODUCTION Antigen presenting cells This is atype of phagocyte. These cells shows antigens on…

Q: Which of these statements about T lymphocytes is false? a. Saome T cells promote the activity of B…

A: Lymphocytes are types of leukocytes. There are two types lymphocytes in immune system:…

Q: Which innate immune system component uses MHC I molecules directly in its defense strategy? a.…

A: The immune system consists of the adaptive and innate immune responses. Innate immunity is present…

Q: HIV causes immunodeficiency by attackinga. memory B cells. c. plasma cells.b. helper T cells. d.…

A: HIV or Human Immunodeficiency Viruses are types of Lentivirus that infect Humans. Here we will see…

Q: What produces Autoantibodies? Select one: a. Macrophages b. Memory T cells c. Plasma B cells d.…

A: Antibodies (immune proteins) that mistakenly target and react with a person's own tissues or organs…

Q: Which of these events is not a part of the second line of defense? You may have more than one…

A: Our body has mainly three line of defence. Defensing foreign substances is important to ensure good…

Q: What is the function of the blood-thymus barrier?a. It protects maturing T-lymphocytes from antigens…

A: The blood thymus barrier found in the cortex part of the thymus.

Q: Antibodiesa. prevent antigens from binding together.b. promote phagocytosis.c. inhibit…

A: Answer: Introduction: Antibody is also known as immunoglobulin, a protein formed by the immune…

Q: B lymphocytes holding knowledge of an infectious agent for future responses are called: a) helper…

A: Immune system acts as a defense system in our body by protecting from effects of pathogens and also…

Q: A patient lacks the ability to make functioning T cells because of a genetic disorder. Would this…

A: T and B cells are major cells that bring about adaptive immune response in human body. T cells are…

Q: may destroy infected cells. Select one: a. Phagocytic cells b. Natural killer T cells C. Cytotoxic T…

A: Pathogens are disease-causing microorganisms that upon entering a healthy body cause a variety of…

Q: To become a fully activated, antibody-secreting cell, B cells usually need: a. to encounter an…

A:

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: Which of the following best describes the movement of a T cell through a lymph node? a. It enters…

A: T-cells are part of the cell-mediated immune system in humans. Lymph nodes are small bean-shaped…

Q: Which of the following can NOT be found in the lymph node? a. Lymph follicle b. White pulp c. Cortex…

A: Lymph nodes contain a large concentration of white blood cells known as lymphocytes, which aid in…

Q: These two cells destroy an infected cell by releasing chemicals that cause apoptosis. a. NK cell and…

A: A series of certain molecular reactions might cause the death of a biological cell. This phenomenon…

Q: Antibody-mediated immunitya. works best against intracellular antigens.b. regulates the activity of…

A: Antibody-mediated immunity: Antibody-mediated immunity is also referred as Humoral immunity which…

Q: Which of the following pairs is mismatched? a. T-cell activation: cell division and…

A: T-cells are white blood cells that take part in the cell-mediated immune response. T-cells are part…

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…

Q: MHCII molecules will bind __________ and locate to the cell surface. a. T-independent type antigens…

A: T cells are not able to recognize free antigens directly. They can recognise only antigens that are…

Q: List 3 things that helper T cells do:

A: Thymus is the site where T-lymphocytes get mature. T-lymphocytes arises in bone marrow. when t-cells…

Q: Explain why the secondary immune response (months, years, or decades after the first exposure to a…

A: Immunity is a phenomenon build up inside the body of an organism in order to cope up with foreign…

Q: Which of the following describes the developmental pathway for T cells? a. thymus → bone marrow →…

A: A type of leukocyte that plays an important role in the immune system refers to the T cell. T cells,…

Q: When an antigen complex is bound to a Class I MHC molecule, it can stimulate a A) B cell. B) plasma…

A: MHC or major histocompatibility complex molecules are glycoproteins which are encoded in a large…

Q: Select the type of T cell that plays a role in diminshing an immune response:

A: T cell or T lymphocyte, is a vital component of the immune system. When it comes to protecting the…

Q: Virus-infected cells are detected and destroyed by which cells of the immune system? A)helper T…

A: C)-cytotoxic T cells

Q: Which of the following cell types is unable to interact with naive T cells and induce their…

A: Those cells of the immune system that target specific antigens are T cells. The origin of these…

Q: Which of the following can serve as antigen-presenting cells (APCs)?a. T cells b. B cells c.…

A: Antigen-presenting cells (APC) include a diverse group of immune cells that mediate cellular immune…

Q: A. When heart muscles due we have a heart attack. Death is usually from lack of O2… but how can that…

A: A circulatory system is composed of the heart that pumps blood and blood vessels (arteries and…

Q: After his recovery from chickenpox, which lymphocytes will keep this patient from becoming infected…

A: Immune system is system which helps our body to fight against the foreign substances which will…

Q: Which statement is incorrect? a. IgG is the most abundant antibody in blood b. Antibodies can exist…

A: Only Option C is incorrect  Because, Immunoglobulin M (IgM): Found fundamentally in blood and lymph…

Q: The first line of defense against pathogens includes a. NK cells. b. stomach PH. c. phagocytes. d.…

A: The first line of defense against pathogens Answer : b Stomach pH The first line of defense…

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.