Features of immunoglobulins include all of the following, EXCEPT, All immunoglobulins' constant regions include both heavy chains and both light chains IgA is a dimerized immunoglobulin that can be part of a mucus membranes' secretions All antibodies are secreted after the B cell becomes a plasma cell All immunoglobulin classes have disulfide bridges connecting heavy chains in at least 1 spot Immunoglobulins bind to antigens at the variable region only Immunoglobulins can also activate innate immune cells to carry out host defenses

Features of immunoglobulins include all of the following, EXCEPT, All immunoglobulins' constant regions include both heavy chains and both light chains IgA is a dimerized immunoglobulin that can be part of a mucus membranes' secretions All antibodies are secreted after the B cell becomes a plasma cell All immunoglobulin classes have disulfide bridges connecting heavy chains in at least 1 spot Immunoglobulins bind to antigens at the variable region only Immunoglobulins can also activate innate immune cells to carry out host defenses

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter12: Body Defenses

Section: Chapter Questions

Problem 14RE

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The Adaptive Immune Response Is a Specific Defense Against Infection Name the class of molecules that includes antibodies, and name the five groups that make up this class.
The ends of each heavy chain and light chain in an immunoglobulin make up the antigen-binding sites. The end of one of these chains is shown here. Biochemists tend to classify protein structures into four groups: mostly alpha, mostly beta, mixed alpha and beta, or neither alpha nor beta. Based on the model shown here, how would you classify this part of the immunoglobulin protein? The loopy polypeptide segments at the very top of the structure shown are the segments that actually contact the antigen. Would you expect these binding segments to be rigid or flexible?
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. 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 is an immunoglobulin? Describe the structure of an immunoglobulin molecule (light chain and heavy chain).
Draw 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.
You can choose one or more than one option Antibodies: IMMUNOLOGY basic have two identical antigen-binding sites. consist of two identical heavy chains and two identical light chains. are secreted by plasma cells are produced by T lymphocytes during adaptive immune response can bind their constant heavy chain region to phagocytes Which of the following proteins are transmembrane proteins? CELL BIOLOGY basic integrin oestrogen receptor phospholipase C adenosine triphosphate (ATP) synthase growth factor receptor What are the correct statements? MOLECULAR BIOLOGY advanced A mutation located within a promoter can change the gene expression. An mRNA can be differentially spliced according to the tissue. RNA transcribed by the RNA polymerase II are translated The end of the transcription process requires a specific DNA sequence A reverse transcriptase can polymerise either a DNA or an RNA strand. Which of the following cells kill other cells by exocytosis of…
In addition to phagocytosis, neutrophils use a process called NETs. Which one of the following describes this process? Group of answer choices A. NETs is a neutrophil process that activates the complement system of proteins, which destroys pathogens. B. A net-like structure of DNA, histones, lactoferrins, gelatinase, cathepsin G, and myeloperoxidase is secreted at pathogens. Together these chemicals destroy pathogens. C. NETs works when neutrophils secrete major basic proteins onto pathogens, destroying the pathogens' cell membranes. D. NETs are chemicals secreted by neutrophils that trigger the rapid maturation of lymphoid stem cells into lymphocytes.
Some species, like camels, alpacas, and llamas, have evolved variant forms of immunoglobulin proteins that retain the ability to bind to antigens. While overall the antibodies made by these animals are simpler than human or mouse antibodies, an important feature conserved among all of these antibodies is: The presence of both heavy and light chain polypeptides Antigen-binding sites comprised of VH and VL sequences The presence of exactly three constant region domains The presence of two antigen-binding sites per antibody The presence of multiple disulfide bonds linking antibody light chains to heavy chains
Like many proteins that do their jobs outside of cells, immunoglobulin G is a glycoprotein. The oligosaccharide chains are attached to the “stem” of the Y-shaped molecule and are believed to help protect the protein. Based on your understanding of carbohydrates, explain why it would not make sense for the immunoglobulin’s two antigen-binding arms to have attached oligosaccharides
The 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.
How are antibodies unique? Please discuss the structure of an antibody. What are the V and C regions? Discuss how the few hundred genes involved are capable of making endless amounts of antibodies. Besides medical treatment what is another way antibodies can be used?
Antibody diversity is generated by multiple mechanisms, each of which contributes to the generation of antibodies with up to 1011 different amino acid sequences in their antigen-binding sites. Several of these mechanisms involve changes in the DNA sequences encoding the antibody heavy and light chain proteins. One mechanism that does not rely on changes to the DNA within the immunoglobulin heavy and light chain gene loci is, instead, dependent on: The contributions of amino acids from both the heavy chain and the light chain to form the antigen-binding site The random usage of V, D, and J gene segments to form the heavy chain V region sequence The random usage of k light chains versus l light chains to pair with the heavy chain The activity of TdT to add random nucleotides at the junctions between the V, J, and D region sequences The fact that heavy chain V regions contain an extra gene segment encoded by the D region compared to light chain V regions

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		All immunoglobulins' constant regions include both heavy chains and both light chains
		IgA is a dimerized immunoglobulin that can be part of a mucus membranes' secretions
		All antibodies are secreted after the B cell becomes a plasma cell
		All immunoglobulin classes have disulfide bridges connecting heavy chains in at least 1 spot
		Immunoglobulins bind to antigens at the variable region only
		Immunoglobulins can also activate innate immune cells to carry out host defenses