Biology
4th Edition
ISBN: 9781259188121
Author: Peter Stiling, Robert Brooker, Linda Graham, Eric Widmaier
Publisher: McGraw-Hill Education
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Chapter 53, Problem 10TY
Summary Introduction
Introduction: AIDS is one of the most dangerous and severe diseases. AIDS stands for “Acquired immunodeficiency syndrome”. The causative agent of this disease is a virus called “human immunodeficiency virus” or HIV. It is a type of retrovirus. This virus has the ability to cause a deficiency in the immune system of the body. The role of the immune system is to protect the body from harmful pathogens.
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Which of the following is a function of cytokines?
A. Promote antibody invaders.
B. Help T cells recognize invaders.
C. Attract white blood cells to a possible invader.
D. Destroy cancer cells.
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.
Which of the following statements about T cells is false? a. Helper T cells release cytokines while cytotoxic T cells kill the infected cell. b. Helper T cells are CD4+, while cytotoxic T cells are CD8+. c. MHC II is a receptor found on most body cells, while MHC I is a receptor found on immune cells only. d. The T cell receptor is found on both CD4+ and CD8+ T cells.
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- Which of the following pairs is mismatched? a. plasma cell: mediation of phagocytosis and killing of microorganisms in the plasma b. megakaryocyte: formation of platelets c. dendritic cell: activation of adaptive immune responses d. natural killer cell: develops from a common lymphoid progenitor e. neutrophil: formation of pus f. regulatory T cell: inhibition of T-cell activity.arrow_forwardExplain why each choice (a-d) is correct or incorrect. T cells are differentiated into two groups based on their glycoproteins CD4 or CD8. Which of the following is true of CD4 T cells? a. They become cytotoxic T cells. b. The become antigen presenting cells. c. They become T helper cells. d. They become plasma cells.arrow_forwardThe immune system includes the various responses the body uses to ensure survival in the presence of disease-causing agents. Identify the example of innate immunity. A. Infected host cells are killed by toxic proteins from cytotoxic T cells. B. Toll-like receptors bind to foreign molecule fragments to initiate immune response. C. CD4 accessory proteins on the helper T cell surface bind to class II MHC molecules. D. IgE antibodies recognize and attach to pollen grains, stimulating an allergic reaction.arrow_forward
- Complement must be inactivated because if it were NOT, A. protein synthesis would be inhibited, thus halting important cell processes. В. necessary interferons would not be produced. C. viruses could continue to multiply inside host cells using the host's own metabolic machinery. D. it could make holes in the body's own cells.arrow_forwardVaccines are given to provide protection against pathogen causing infections. Which of the following statements best describes how vaccines work? a Fever and swelling develop which is the first response in killing a pathogen b. Antibodies in the vaccine provide the body with nonspecific immunity to an antigen. c. An inactivated or killed virus stimulates the body to develop specific immunity to that type of virus. d. Heathy bacteria causes the body to release toxins which will protect the body if later exposed to different type of bacteria.arrow_forwardWhich of the following best describes the movement of a T cell through a lymph node? a. It enters via efferent lymphatics and exits via the bloodstream. b. It enters via afferent lymphatics and exits via the bloodstream. c. It enters via the bloodstream and exits via afferent lymphatics. d. It enters via the bloodstream and exits via the bloodstream. e. It enters via the bloodstream and exits via efferent lymphatics.arrow_forward
- An MHC class II/antigen complex on the surface of an antigen-presenting cell (APC) binds to a T-cell receptor. What results from this interaction? Select one: a. Other immune cells are stimulated to respond to the antigen. b. Other immune cells are inhibited. c. The T cell responds by directly destroying the APC. d. The antigen is phagocytized by the T cell.arrow_forwardCHAPTER 20 The Lymphatic System and Immunity Matching SECTION 3 Revie w Match each lettered term with the most closely related description. a. opsonization 1 b. helper T cells Two parallel pairs of polypeptide chains Found on helper T cells C. antibody d. class II MHC 3 Active and passive 4 Transfer of antibodies e. costimulation Attacked by HIV f. IgM 6 Enhances phagocytosis g. class I MHC h. IgG 7 MHC proteins present in the plasma membranes of all nucleated cells i. passive immunity j. anaphylaxis 8 Differentiate into memory and plasma cells 9 MHC proteins present in the plasma membranes of all APCS and lymphocytes 9 k. CD4 markers 10 I. acquired immunity 10 Antibodies used to determine blood type 11 m. B lymphocytes 11 Secondary binding process required for T cell activation 12 12 Accounts for 80 percent of all immunoglobulins 13 13 Circulating allergen stimulates mast cells throughout body Match each lettered term with thearrow_forwardA good example of molecular mimicry is a. Decreased number of regulatory T cells in aging. b. The release of antigen sites of immune privilege. c The immune system attacks autoantigens because they are similar to bacterial antigens. d. Similarities between the shape of immune cells and pathogens.arrow_forward
- When a helper T cell releases interleukin-1 to stimulate surrounding leukocytes, interleukin-1 is acting as: A. paracrine B. neurotransmitter C. autocrinearrow_forwardA number of minor cancerous cells and infected viruses, such as Epstein Barr (EBV), are able to go undetected by cytotoxic T cell degradation by what possible mechanism? a. the production of normal class I MHC molecule b. helper T cell activation c. the deactivation of the complement system d. tumor antigen expression e. the production of the class II major histocompatability (MHC) moledulearrow_forwardTo become a fully activated, antibody-secreting cell, B cells usually need: a. to encounter an antigen or receive a signal delivered by a helper T cell. b. to ingest a foreign invader such as a microobe. c. activation by a plasma cell d. contact with an antigen and helper T cell cytokinesarrow_forward
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