Prescott's Microbiology
10th Edition
ISBN: 9781259281594
Author: Joanne Willey, Linda Sherwood Adjunt Professor Lecturer, Christopher J. Woolverton Professor
Publisher: McGraw-Hill Education
expand_more
expand_more
format_list_bulleted
Question
Chapter 34, Problem 4CHI
Summary Introduction
Antigen-presenting cells (APCs) are immune cells that play an important role in mediating the cellular immune mechanism by processing and presenting antigens (Ags) for T cell recognition. Classical APCs include B cells, dendritic cells, macrophages, and Langerhan cells. APCs are crucial for an effectual adaptive immune response since both cytotoxic and helper T cells are depending on APCs for effective functioning.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
T cells and B cells have many similarities in how they produce their highly diverse repertoire of antigen receptors, but one important difference between them is that B cell receptors can undergo somatic hypermutation to alter their affinity for antigen. This is known as ‘affinity maturation’, and the result is that the pool of B cells specific for a particular microbe will increase their binding affinity. T cells do not engage in either somatic hypermutation or affinity maturation. Why not? What potential harm could come from allowing T cells to alter the affinity of their TCRs after they have already left the thymus and have become activated in a lymph node or spleen?
What are the first and second signals in activation of a T cell?
In the process shown in Diagram 2, what performs the function most similar to that of the activated T cell in Diagram 1?
Chapter 34 Solutions
Prescott's Microbiology
Ch. 34.2 - What does the term valence mean and how does an...Ch. 34.2 - Distinguish between self and nonself substances.Ch. 34.2 - Prob. 2RIACh. 34.2 - How does a hapten differ from an antigen?Ch. 34.3 - What are the types of adaptive immunity?Ch. 34.3 - What distinguishes natural from artificial...Ch. 34.3 - What are ways that active immunity is different...Ch. 34.3 - Of the four types of acquired immunity, which do...Ch. 34.4 - On what types of cells are MHC class I molecules...Ch. 34.4 - Prob. 2MI
Ch. 34.4 - What are MHCs and HLAs? Describe the roles of the...Ch. 34.4 - Prob. 2RIACh. 34.4 - Prob. 3RIACh. 34.4 - How are foreign peptides processed so as to...Ch. 34.5 - Prob. 1MICh. 34.5 - Prob. 1RIACh. 34.5 - Prob. 2RIACh. 34.5 - Describe antigen processing. How does this process...Ch. 34.5 - Prob. 4RIACh. 34.5 - Prob. 5RIACh. 34.5 - Prob. 6RIACh. 34.6 - Which cells are functioning as APCs in this...Ch. 34.6 - Prob. 1RIACh. 34.6 - Briefly compare and contrast B cells and T cells...Ch. 34.6 - Prob. 3RIACh. 34.6 - Prob. 4RIACh. 34.7 - Prob. 1MICh. 34.7 - Prob. 2MICh. 34.7 - Prob. 3MICh. 34.7 - Prob. 1.1RIACh. 34.7 - Prob. 1.2RIACh. 34.7 - Prob. 1.3RIACh. 34.7 - Prob. 1.4RIACh. 34.7 - Prob. 2.1RIACh. 34.7 - Prob. 2.2RIACh. 34.7 - Prob. 2.3RIACh. 34.7 - Prob. 2.4RIACh. 34.7 - Prob. 2.5RIACh. 34.7 - Prob. 3.1RIACh. 34.7 - Prob. 3.2RIACh. 34.7 - In addition to combinatorial joining, what other...Ch. 34.8 - What is the difference between a precipitation and...Ch. 34.8 - Prob. 1RIACh. 34.8 - Prob. 2RIACh. 34.8 - How does opsonization inhibit microbial adherence...Ch. 34.8 - Prob. 4RIACh. 34.9 - Prob. 1RIACh. 34.9 - How would you define anergy?Ch. 34.10 - Prob. 1MICh. 34.10 - Prob. 2MICh. 34.10 - Prob. 1.1RIACh. 34.10 - Prob. 1.2RIACh. 34.10 - Prob. 1.3RIACh. 34.10 - Prob. 1.4RIACh. 34.10 - Prob. 1.5RIACh. 34.10 - What is an autoimmune disease and how might it...Ch. 34.10 - Prob. 2.2RIACh. 34.10 - Prob. 2.3RIACh. 34.10 - Prob. 2.4RIACh. 34 - What properties of proteins make them suitable...Ch. 34 - What other biotechnologies could be invented based...Ch. 34 - Speculate as to how MHC, TCR, and BCR molecules...Ch. 34 - Prob. 4CHICh. 34 - Prob. 5CHICh. 34 - In an effort to better understand the mechanisms...Ch. 34 - Prob. 7CHI
Knowledge Booster
Similar questions
- In what way does the T cell’s membrane receptors differ from the B cell’s membrane receptor? In other words, what will each bind to?arrow_forwardIf you had to choose between losing function of your B or T cells, which would you choose, and why?arrow_forwardB cells express a complement receptor that binds to C3b cleavage products, such as iC3b and C3dg. When a B cell with an antigen receptor that specifically recognizes that pathogen also has its complement receptor stimulated because the pathogen is opsonized with these C3 fragments, B cell activation is greatly enhanced. Due to this mechanism, B cells can be activated by much lower concentrations of antigen (in this case, the pathogen) than if the antigen is devoid of complement components. This mechanism functions to: Ensure that pathogens are readily detected by the adaptive immune system before they replicate to high levels in the host Prevent B cells from being activated in response to antigens that are not pathogens Allow B cells to phagocytose the pathogen and help destroy it Induce increased rounds of B cell replication to make more pathogen-specific B cells Allow the B cell to block pathogen replication by interfering with multiple pathogen surface functionsarrow_forward
- What is the two types of cells that result from activation of B and T cells?arrow_forwardIt is often helpful to draw a complicated pathway in the form of a flow chart to visualize the multiple steps and the ways in which the steps are connected to each other. Draw the antibody-mediated immune response pathway that acts in response to an invading virus.arrow_forwardFasL (in a somatic cell ) interaction with Fas receptor in ( an immune cell) will lead to ............ of the immune cell.arrow_forward
- Some viruses have mechanisms to down-regulate MHC class I protein expression on the surface of cells in which the virus is replicating. This immune evasion strategy might prevent effector CD8 cytotoxic T cells from recognizing and killing the virus-infected cells. Would this immune evasion strategy also prevent the initial activation of virus-specific CD8 T cells? Yes, because no viral peptide:MHC class I complexes would form to activate CD8 T cells. No, because dendritic cells would take up infected cells and cross-present viral peptides to activate CD8 T cells. No, because some presentation of MHC class I complexes with viral peptides would occur before the virus could down-regulate all the surface MHC class I protein. Yes, because this immune evasion strategy would also function in dendritic cells, even if the virus doesn’t replicate in dendritic cells. No, because the type I interferon response induced by the virus infection will up-regulate MHC class I expression and override the…arrow_forwardDraw a schematic diagram of a typical IgG molecule and label each of the following parts: H chains, L chains, intrachain disulfide bonds, hinge, Fab, Fc, and all the domains. Indicate which domains are involved in antigen binding.arrow_forwardThe T-cell receptor gene segments are arranged in a similar pattern to immunoglobulin gene segments and are rearranged by the same enzymes. While B cells and T cells differ markedly in their functions during an immune response, the two lymphocyte subsets share the enzymatic machinery and overall scheme for generating antigen receptor diversity. This is because: B cells and T cells recognize the same form of antigen expressed by an infecting pathogen. Animals with B cells developed first, and later evolving species then developed T cells. B cells and T cells both need enormous antigen receptor diversity to provide protection against the diversity of pathogens. Antibody and T-cell receptor gene segments are both flanked by similar recombination signal sequences. B cells and T cells both secrete their antigen receptor proteins after they are activated by antigen-binding.arrow_forward
- CD8 T cells in a culture are analyzed for their ability to produce the cytokine IFN-g, and the numbers of IFN-g-producing CD8 T cells are quantified. As a control, T cells are also stimulated with an irrelevant non-viral peptide (ova) plus dendritic cells. The results are shown in the figure below. Why is the T cell response different between the two lymph node populations?arrow_forwardWhat is a T-cell receptor and how is it involved in T-cell activation?arrow_forwardHow is a B-cell receptor similar to an antibody?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning
Human Heredity: Principles and Issues (MindTap Co...
Biology
ISBN:9781305251052
Author:Michael Cummings
Publisher:Cengage Learning