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Q: contrast cytotoxic T cells and NK cells
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A: Skin is the largest organ of the integumentary system that covers the body and provides three main…
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- Superantigensa) are exceptionally large antigen molecules.b) cause a very large antibody response.c) elicit a response from a large number of T cells.d) attach non-specifically to B-cell receptors.e) assist in a protective immune response.Helper T cells: A) produce antibodies B) can act as memory cells C) initiate both the cell mediated response and the humoral response D) all of the above41) For the successful development of a vaccine to be used against a pathogen, it is necessary that A) the surface antigens of the pathogen do not change. B) a rearrangement of the B cell receptor antibodies takes place. C) all of the surface antigens on the pathogen be identified. D) the pathogen has only one epitope. E) the MHC molecules are heterozygous. 42) In the human disease known as lupus, there is an immune reaction against a patient's own DNA from broken or dying cells, which categorizes lupus as A) an allergy. B) an immunodeficiency. C) an autoimmune disease. D) an antigenic variation. E) a cancer.
- 7. Which of these cells can activate both B & T lymphocytes? a) Helper T cells b) Plasma cells c) Cytotoxic T cells d) Neutrophils e) Mast cells 8. Which of the following happens when a B cell is activated? a) Inflammation b) The activated B cell differentiates into plasma cells and memory cells c) The B cell will suppress the immune response d) It acts as a phagocyte to engulf antigens e) The activated B cell will release haptens 9. How are T lymphocytes activated? a) Release of histamine during the inflammatory process triggers their activation b) By interferon and antibodies Contact with exposed collagen activates helper T cells d) Through direct contact with a foreign antigen e) Activation of any component of the nonspecific immune response will activate T cells 10. The variable region of an antibody c) ngang naging a) Binds to a specific epitope on an antigen. b) Can bind to several different antigens on the same bacterial cell. c) Binds to the first complement protein (C1). d) Is…Choose the most accurate characteristic of B cells. A) They help establish and control the sensitivity of the immune response. B) They stimulate the activities of T cells. C) They attack foreign cells, normal cells infected with viruses, and cancer cells that appear in normal tissues. D) They continually monitor peripheral tissues. E) They differentiate into plasma cells that secrete antibodies.The correct order of words to describe how innate immune response responds to a pathogen that has gotten by the physical and chemical barriers is: À) Skin, Saliva, Cytokines, Macrophage B)Macrophage, Cytokines, Neutrophil, Natural Killer Cell C) Neutrophil, Cytokines, Killer T Cell, Antibodies D) Antigen, Macrophage, B Cell, Killer T Cell
- i) True or False : Antibodies attach firmly to an antigenic determinant called an epitope.ii) True or False: Band T-cells are the components of the adaptive immune system.iii) True or False: Swelling, redness, and pain of the injured part are due to inflammation of the injured tissue.iv) True or False: Insertion of complement proteins C7, C8, and C9 into the cell membrane of the pathogen is due to the Amphipathic nature of these proteins.v) True or False: During inflammation cells from the adaptive immune systems are mainly recruited towards the site of infection.vi) True or False: Cytokines are released by Macrophages for the killing of the Ag directly.vii) True or False: Macrophages always mature into monocytes at the site of infection.viii) True or False: All components of the Complement systems remain active in the body all the time.ix) True or False: All the factors of the complement system remain active except factor-D due to its substrate specificity for factor-B, bound to…A deficiency of both B cells and T cells is most likely a(n)... a)secondary immunodeficiency b)complex immunodeficiency c)acquired immunodeficiency d)primary immunodeficiency e)induced immunodeficiencya) As a scientist trying to cure allergies, you would be happy to discover a drug that destroys all mast cells. How can this medicine help prevent allergies? What negative side effects can this drug have?b) Compare the defense mechanisms that occur in response to bacterial and viral pneumonia.
- Select all of the following that are functions performed by different antibodies. a) Group of answer choices b) Attracting natural killer cells to destroy an infected cell. c) Blocking the ability of a pathogen to bind to a host cell d) Lysing a pathogen cell wall or lipid bilayer. e) Marking a pathogen so that innate immune cells destroy the pathogen. f) Helping complement proteins bind to a pathogen.Which of the following components of the immune system recognizes pathogen-associated molecular patterns? a.) Macrophages b.) Dendritic cells c.) Proteins of the complement system d.) All of aboveDelayed-type hypersensitivity reactions in the skina) are characterized by a wheal and flare reaction.b) peak at 4 to 6 hours after exposure to antigen.c) require complement activation.d) show induration because of the influx of sensitized T cells and macrophages.e) depend on activities of the Fc portion of antibodies.