Which of the following describes the developmental pathway for T cells? a. thymus → bone marrow → spleen b. thymus → bone marrow → thymus c. bone marrow → thymus → lymph nodes d. lymph nodes → thymus → spleen e. bone marrow → lymph nodes → thymus.

Q: What stimulates T-cell lymphocytes to undergo clonal selection?

A: Acquired immunity develops after birth. It is formed by B and T lymphocytes. B lymphocytes provide…

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: Compare and contrast the activities of B cells versus T cells.

A: Introduction: The immune system is involved in protecting the human body from any invading pathogen.…

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: Cell-mediated immune response includes the following except to ______. A. activate B lymphocyte B.…

A: Cell mediated immune response is carried out by T lymohocytes of our immune system. It is an immune…

Q: A. Kills diseased human cells B. Targets primarily eukaryotic pathogens and viruses C. Stimulates…

A: 1. Neutrophils- They constitute the majority of the white blood cells( 50℅- 70%). In response to…

Q: The process of removing auto-reactive b and T cells during maturation is called: a. Clonal…

A: Clonal deletion is the removal through apoptosis of B cells and T cells that has expressed…

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: All of the following are examples of how tumors or the microenvironment in which they develop…

A: Tumor cells are able to stimulate specific adaptive immune responses. However, most frequently these…

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: An allergic reaction is an example of:

A: An allergic reaction is an example of:

Q: If an individual failed to develop a thymus because of a genetic defect, what would happen to the…

A: Without the development of a thymus, immune responses mediated by antibodies and cytotoxic T cells…

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 these statements about gamma interferon is false? a. It is a polypeptide autocrine…

A: The interferon gamma is a dimerized soluble cytokine that is the only member of type II class of…

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: Upon reexposure to a pathogen, a memory B cell can differentiate to which cell type? a. CTL b. naïve…

A: Second line defence or non-specific defence is primarily dependent upon Neutrophils, macrophages and…

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: Receptors that trigger innate immune responses a. are antibodies recognizing specific antigens.…

A: The first line of defense against invading pathogens is the innate immune response. They are also…

Q: Which of these cell types aids the activation of T lymphocytes by antigens? a. Macrophages b.…

A: The immune system of a body is broadly classified into innate and acquired type. Innate immunity is…

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: What is the role of B and T memory cells?

A: B and T cells together becomes memory cells.

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: In humans, B cells mature in the and T cells mature in the.a. GALT, liver b. bursa, thymus c. bone…

A: White blood cells (WBCs) play an important role in defending the body against antigens, like…

Q: Which are important in nonspecific immune defenses? a. interferons b. lymphocyte activation c.…

A: The immune system is an organ system of the body that is functionally responsible for protecting the…

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: Which of the following cells are primarily targeted by HIV? a. Nerve cells. b. Helper T celIs. c.…

A: HIV targets the immune system. It takes around one to two days to arrive at lymph nodes then these…

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: What is the function of cytotoxic T-cells?

A: Acquired immunity develops after birth. It is provided by B and T lymphocytes.

Q: of the choices, which cells stimulate directly B cells to divide and produce antibodies? a. mast…

A: The immune system provides defense against invading pathogens. It is a complex network of cells,…

Q: Which part of an antibody binds to the antigen? a. Heavy chain. b. Light chain. c. Variable region.…

A: Which part of the antibody binds to antigen ? Answer : c. Variable region The variable region is…

Q: How could you distinguish the type of T cell that is active in an immune response? What outcomes…

A: T-cell is a type of white blood cell which is an essential part of the immune system in the body.…

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

A: C)-cytotoxic T cells

Q: Chronic granulomatous disease Select one: A. is caused by a decrease in the number of phagocytes.…

A: Immunodeficiency occurs due to hereditary defects are called primary immunodeficiency and when…

Q: Unlike cytotoxic T lymphocytes, NK cells do not _____. (Select all that apply.) a. secrete…

A: Natural killer (NK) cells are lymphocyte that descend from the very same progenitor as T and B…

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 of the following should be the same inidentical twins?(A) the set of antibodies produced(B)…

A: The term MHC denotes Major Histocompatibility complex molecule. This molecule is the host protein…

Q: T cells that react with self antigens are destroyed through: A. cytokinesis b. macrophages c.…

A: The T cells are one of two lymphocytes and play an important role in the immune system. B-cells are…

Q: Which of the following statements is not true?(A) An antibody has more than one antigen-binding…

A: The ability of the body to defend itself against invading foreign agents like bacteria, viruses, or…

Q: Illustrate the T-cell developmental process

A: Introduction: The production of leucocytes (white blood cells) is referred to as leucopoiesis. It is…

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.