Given the low likelihood of a B cell and T cell having the same antigen specificity, what is one mechanism that regulates this interaction? the proximity of the T-cell and B-cell zones the expression of complement receptors on B cells O the expression of CCR7 by B cells and CXCR5 by T cells the presentation of antigens to T cells by macrophages

Given the low likelihood of a B cell and T cell having the same antigen specificity, what is one mechanism that regulates this interaction? the proximity of the T-cell and B-cell zones the expression of complement receptors on B cells O the expression of CCR7 by B cells and CXCR5 by T cells the presentation of antigens to T cells by macrophages

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter34: Immunity

Section: Chapter Questions

Problem 3SA: Which of the following is not a part of innate immunity? a. phagocytic cells e. inflammation b....

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Which of the following is not a part of innate immunity? a. phagocytic cells e. inflammation b. fever f. complement activation c. histamines g. presenting antigen d. cytokines h. all take part
How do B and T cells differ with respect to antigens that they bind?
Figure 42.11 Which of the following statements about T cells is false? Helper T cells release cytokines while cytotoxic T cells kill the infected cell. Helper T cells are CD4+, while cytotoxic T cells are CD8+. MHC II is a receptor found on most body cells, while MHC I is a receptor found on immune cells only. The T cell receptor is found on both CD4+ and CD8+ T cells.
Which innate immune system component uses MHC class I molecules directly in its defense Strategy? a. macrophages b. neutrophils c. NK cells d. interferon
Match the immunity concept with the best description. _____ anaphylactic shock a. recognizes antigen _____ immune memory b. insufficient immune response _____ immune deficiency c. general defense mechanism _____ autoimmunity d. immune response against ones own body _____ antigen receptor e. secondary response _____ inflammation f. acute allergic reaction
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
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.
When an immature dendritic cell becomes an activated dendritic cell, all of the following changes occur except _____. a. confinement to T-cell regions of lymph node cortex b. development of elaborate finger-like processes c. upregulated expression of MHC class II at the cell surface d. loss of antigen-processing functions e. expression of Toll-like receptor TLR9.
Put the following steps in order for cell-mediated immunereactions:(a) Differentiated T cells include T helper, delayed hyper-sensitivity, cytotoxic, and memory T cells that all havedifferent immunological functions depending on the an-tigen presented.(b) Antigen-presenting cells (macrophages and dendriticcells) phagocytize pathogens, ingesting and degradingthem into pieces which are transported to the surface ofthe cell.(c) T cells bearing the corresponding receptor for the pre-sented antigen bind to it and become activated only ifthe appropriate MHC is also present.(d) Some pieces of the pathogen’s antigens are processedby inserting them into the antigen-presenting cell’smembrane and are held in place by class II majorhistocompatibility complex (MHCII) proteins.(e) Activated T cells are stimulated to divide and differen-tiate into different types of T cells, including memorycells
Which of the following is NOT true of Innate Lymphoid Cells (ILCs)? A) Each ILC type responds to a different category of pathogens. b.)) ILCs are derived from the common lymphoid precursor. c. )) ILCs rearrange their antigen receptors in a similar way to T-cells. d. ))Each ILC type is distinguished by the cytokines that it produces. e. ))Development of each ILC type is driven by unique transcription factors.
Which of the following is not associated with killing by a cytotoxic T cell? View Available Hint(s) for Part A granzyme CD95 perforin IL-4
All of the following are characteristic of regulatory T cells except a. they express CD25 b. they facilitate the proliferation of naive T cells interacting with the same antigen-presenting cell c. they express CD4 d. they express the transcriptional repressor FoxP3 e. they express MHC class II-restricted T-cell receptors specific for self antigen.