Microbiology: An Evolving Science (Fourth Edition)
4th Edition
ISBN: 9780393615098
Author: John W. Foster, Joan L. Slonczewski
Publisher: W. W. Norton & Company
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Chapter 24.2, Problem 4TQ
Summary Introduction
To review:
The reason for the delta region being no switch region.
Introduction:
B cells in the human blood secrete a complex of proteins that are termed as antibodies. Antibodies play a vital role in eliminating foreign invaders from the human body. They mark the foreign bodies by binding with them so that the immune system can effectively and selectively eliminate the invaders.
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Immature B-cells express only IgM on its membrane, and if it encounters antigen the IgM will be stripped off and the cell will stimulated to undergo apoptosis. A mature B-cell expresses IgM and IgD on its membrane. What mechanism allows these cells to express and secrete IgE antibodies in type I hypersensitivity reactions? Explain this mechanism.
Chapter 24 Solutions
Microbiology: An Evolving Science (Fourth Edition)
Ch. 24.1 - Prob. 1TQCh. 24.1 - Prob. 2TQCh. 24.1 - Prob. 3TQCh. 24.2 - Prob. 1TQCh. 24.2 - Prob. 2TQCh. 24.2 - Prob. 3TQCh. 24.2 - Prob. 4TQCh. 24.2 - Prob. 5TQCh. 24.3 - Prob. 1TQCh. 24.3 - Prob. 2TQ
Ch. 24.3 - Prob. 3TQCh. 24.4 - Prob. 1TQCh. 24.4 - Prob. 2TQCh. 24.5 - Prob. 1TQCh. 24.5 - Prob. 2TQCh. 24.6 - Prob. 1TQCh. 24.6 - Prob. 2TQCh. 24 - Prob. 1RQCh. 24 - Prob. 2RQCh. 24 - Prob. 3RQCh. 24 - Prob. 4RQCh. 24 - Prob. 5RQCh. 24 - Prob. 6RQCh. 24 - Prob. 7RQCh. 24 - Prob. 8RQCh. 24 - Prob. 9RQCh. 24 - Prob. 10RQCh. 24 - Prob. 11RQCh. 24 - Prob. 12RQCh. 24 - Prob. 13RQCh. 24 - Prob. 14RQCh. 24 - Prob. 15RQCh. 24 - Prob. 16RQCh. 24 - Prob. 17RQCh. 24 - Prob. 18RQCh. 24 - Prob. 19RQCh. 24 - Prob. 20RQCh. 24 - Prob. 1TQCh. 24 - Prob. 2TQCh. 24 - Prob. 3TQCh. 24 - Prob. 4TQCh. 24 - Prob. 5TQ
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Similar questions
- Sketch a B cell antigen receptor. Label the V and C regions of the light and heavy chains. Label the antigenbinding sites, disulfide bridges, and transmembrane region. Where are these features located relative to the V and C regions?arrow_forwardA ‘B’ lymphocyte demonstrates ‘B cell receptors’ on its surface. These receptors have ‘variable’ regions which match the variable regions of the antibodies released by the plasma cell (formed by the activated B lymphocyte). Which of the following types of antibodies forms these ‘B cell receptors’ ? Choose one from the following: (A) IgG (B) IgA (C) IgD (D) IgEarrow_forwardWhat is the function of the Fc portion of antibodies? List an example. How can phagocytic cells phagocytose foreign cells and damaged self cells, but not healthy self cells?arrow_forward
- What does a humoral immunity concept map look like with 10 words or phrases?arrow_forwardBriefly describe the effector functions of the following subsets of CD4* helper T lymphocytes and distinguish their cytokine profiles: уThi cell ii)Th2 cellarrow_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
- A ‘B’ lymphocyte demonstrates ‘B cell receptors’ on its surface. These receptors have ‘variable’ regions which match the variable regions of the antibodies released by the plasma cell (formed by the activated B lymphocyte). Which of the following types of antibodies forms these ‘B cell receptors’ ? IgG IgA IgD IgEarrow_forwardAccording to the clonal selection theory, all immunoglobulin molecules in an individual B cell have the same antigenic specificity. Explain why the presence of IgM and IgD on the same B cell does not violate the nonspecificity implied by clonal selection.arrow_forwardWhat is the mechanism used by B cells to increase antibody diversity should be determined.?arrow_forward
- T cells can differentiate into 5 different subsets of helper T cells. Answer the following questions for TH1 cells: A) In general, list three unique factors that differentiate the TH1 subset from the other subsets. B) For each of those factors identified in A, provide one specific example that applies to TH1 cells. C) What type of pathogens are targeted by the TH1 cells?arrow_forwardIn 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_forwardDiagram an IgG molecule and label (a) the Fc region and (b) the areas that combine with antigen.arrow_forward
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