Which of these is a valid example of an antigen and its corresponding epitope? Select one: a. An antigen is a retrovirus and an epitope is a portion of the retrovirus to which an antibody or T-cell binds. b. An antigen is an antibody and an epitope is the cytotoxic T-cell produced to degrade the antibody. c. None of these choices. d. An antigen is a cytotoxic T-cell and an epitope is a molecular portion of foreign material. e. An antigen is an antibody and the epitope is a virus to which the antigen binds.

Which of these is a valid example of an antigen and its corresponding epitope? Select one: a. An antigen is a retrovirus and an epitope is a portion of the retrovirus to which an antibody or T-cell binds. b. An antigen is an antibody and an epitope is the cytotoxic T-cell produced to degrade the antibody. c. None of these choices. d. An antigen is a cytotoxic T-cell and an epitope is a molecular portion of foreign material. e. An antigen is an antibody and the epitope is a virus to which the antigen binds.

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter17: Genes And The Immune System

Section: Chapter Questions

Problem 31QP

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Suppose a person recovers normally from viral infections, but then gets the same viral infections over and over again- unlike the rest of us. A. What is probably wrong –B cells, helper T cells and/or cytotoxic T cells? B. Should this person be at a higher risk of cancer than the rest of us? C. Should this person be able to lyse bacterial cells as well as the rest of us? D. Should this person tolerate a graft (from an unreated person) better than you are me?
Explain why each choice (a-d) is correct or incorrect. T cells are differentiated into two groups based on their glycoproteins CD4 or CD8. Which of the following is true of CD4 T cells? a. They become cytotoxic T cells. b. The become antigen presenting cells. c. They become T helper cells. d. They become plasma cells.
All of the following are true in reference to T-cell priming except _____. a. it occurs in primary lymphoid organs b. it transforms naive T cells into differentiated effector T cells c. it is the first stage of a primary adaptive immune response d. it requires interaction between naive T cells and antigen-presenting cells e. it takes place in many locations including, but not limited to, lymph nodes, Peyer’s patches, and the tonsils.
Adaptive immunity includes both humoral and cell-mediated immune responses, which interact but also have distinct roles in adaptive immunity. Identify the example of a strictly cell-mediated immune response. A. A cytotoxic T cell destroys an infected host cell. B. A helper T cell activates a B cell. C. A B cell gives rise to plasma cells, which release antibodies. D. An antigen is taken in by an antigen-presenting cell.
Which of the following statements regarding T cells activated by specific antigen is incorrect? a. They receive co-stimulatory signals through CD28. b. They suppress expression of sphingosine 1-phosphate (SIP). c. They take several days before differentiating into effector T cells. d. They cease to secrete and respond to interleukin-2 (IL-2). e. They begin to express CTLA4, which serves to limit T-cell proliferation.
Explain why each choice (a-d) is correct or incorrect. A vaccine is effective because a. The vaccine contains the antibodies necessary to fight infection. b. The vaccine contains the lymphocytes necessary to fight infection. c. The secondary response of the adaptive immunity is faster and more efficient than the primary response. d. B lymphocytes are unable to mount an immune response the first time they are exposed to a new pathogen.
Which of the following is TRUE regarding Gram negative bacteria? a- Their cell wall is composed of a large proportion of sugars b- Their cell wall does not absorb the Gram stain and turns pink c- Their cell wall is composed of a small proportion of peptidoglycan d- Two of the above statements are true Which T-lymphocytes activate the B-cell response? 1- suppressor T-cells. 2- cytotoxic T-cells. 3- helper T-cells. 4- memory T-cells. Substances that are injected containing an antigen to stimulate the immune system to respond are called a- antibodies b- medications. c- vaccines d- antibiotics
Receptors that trigger innate immune responses a. are antibodies recognizing specific antigens. b. are T-cell receptors recognizing specific antigens. c. recognize pathogen-associated molecular patterns. d. are not specific at all.
A patient has contracted an upper respiratory infection caused by a virus. Her initial adaptive immune response to the virus is due to what mechanism of immune surveillance?a. The display of viral antigens by naïve B-cells on class I MHC, which is then recognized by helper T-cells that then activate cytotoxic T-cells.b. The display of viral antigens on class I MHC, which is then displayed to sensitized naïve B-cells, leading to the production of antibodies.c. The display of viral antigens on class II MHC by a sensitized naïve B-cell, which is then activated by a helper T-cell primed to the same antigen to begin producing antibodies.d. The display of viral antigens on class I MHC, which is then displayed to helper T-cells, leading to the activation of naïve cytotoxic T-cells.
Which of the following statements is NOT true of a fever?a. Temperature is regulated by chemicals that reset the body's thermostat to a higher setting.b. The higher than normal body temperature impairs the functions of some bacteria.c. The higher than normal body temperature is always harmful.d. The higher temperature impairs leukocytes andantibody production.e. Both c and d. Which of the following statements is NOT true of antibodies?a. They bind to foreign antigens, making them susceptible to being engulfed by phagocytes.b. They serve as specific binding sites on B cells.c. An antibody is usually able to bind to a variety of different types of antigensd. They are composed of two heavy chains and two light chains.
For question with blanks, choose the combination of answers that most accurately completes the statement. In humans, B cells mature in the .................. and T cells mature in the . a. GALT, liver b. bursa, thymus c. bone marrow, thymus d. lymph nodes, spleen
Activated helper T Cells participate in which of the following processes? a.) Differentiation of memory B cells b.) Activation of cytotoxic T Cells c.) Facilitation of macrophage phagocytosis d.) All of above