EBK WHAT IS LIFE? A GUIDE TO BIOLOGY WI
5th Edition
ISBN: 9781319360689
Author: PHELAN
Publisher: VST
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Chapter 27, Problem 7MC
Summary Introduction
Introduction:
Antibodies are the molecules produced by the B cells that bind to antigens and flag the cell for phagocytosis.
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Which of the following is false about HLA class I molecules?
A. They are encoded by multiple and highly polymorphic genes.
B. They consist of alpha and beta chains.
C. They possess beta-2 microglobulin.
D. They present foreign antigens to cytotoxic T cells.
E. none of the above
Which of the following pairs is mismatched?
a. T-cell activation: cell division and differentiation
b. effector B cell: plasma cell
c. plasma cell: antibody secretion
d. helper T cell: kills pathogen-infected cells
e. helper T cell: facilitates the differentiation of B cells.
Which of the following statements does not
describe tolerogens accurately?
Select one:
A. They can be the same molecules as
immunogens.
B. They lead immune cells to become
unresponsive.
C. They can be foreign antigens.
D. They affect B cells but not T cells.
E. The can be presented by antigen-
presenting cells.
Chapter 27 Solutions
EBK WHAT IS LIFE? A GUIDE TO BIOLOGY WI
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Similar questions
- Antibodies Select one: a. are not specific, but act generally. b. are composed of four light and four heavy polypeptide chains. c. play a large role in cell-mediated immunity. d. are produced by both T and B cells. e. have a variable region that binds to a specific antigenic determinant.arrow_forwardB cells that produce and release large amounts of antibody are called: a. Memory cells b. Basophils c. Plasma cells d. Killer cells e. Neutrophilsarrow_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_forward
- The followings are functions of antibody eliminating unknown particles or cells which enter into the body, except... A. Attach to the active side of particle or cell that enters into the body B. Make easier of macrophage to phagositosize unknown particle or cell that enters the body C. Precipitate the unknown particle that dissolves in body fluid D. Initiate the working system of complement E. Eliminate bacteria that grows on endosome of macropahgearrow_forwardWhich of the following is not a function of antibodies? Select one: a. They neutralize pathogens by masking the pathogen surface. b. They act as molecular adaptors that bridge together pathogen and phagocyte surfaces. c. They exert toxic effects directly. d. They act as opsonins that mediate phagocytosis. e. They activate complement fixation.arrow_forwardWhich 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.arrow_forward
- Which of the following statements is NOT true of a fever?a. Temperature is regulated by chemicals that reset the body's thermostat to a higher setting.b. The higher than normal body temperature impairs the functions of some bacteria.c. The higher than normal body temperature is always harmful.d. The higher temperature impairs leukocytes andantibody production.e. Both c and d. Which of the following statements is NOT true of antibodies?a. They bind to foreign antigens, making them susceptible to being engulfed by phagocytes.b. They serve as specific binding sites on B cells.c. An antibody is usually able to bind to a variety of different types of antigensd. They are composed of two heavy chains and two light chains.arrow_forwardWhich of the following is NOT true about T cells? A. Natural killer cells (NK) are exclusively differentiated T cells B. T cells act in situations where antigens are embedded in cell membranes or are inside host cells and thus are inaccessible to antibodies C. T cells develop from lymphoid stem cells in bone marrow and mature in the thymus D. Cell-mediated immunity is primarily carried out by T cellsarrow_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
- Which of the following statements regarding negative selection of B cells is correct? a. Negative selection is a process that occurs in secondary lymphoid organs. b. Negative selection is a process that occurs in the bone marrow but not in secondary lymphoid organs. c. Negative selection ensures that B cells bearing receptors for pathogens that will not be encountered in a person’s lifetime are eliminated to make room for B cells bearing useful receptors. d. Negative selection eliminates B cells at the end of an infection as a means of terminating an immune response once the pathogen has been removed from the body. e. Negative selection ensures that autoreactive B cells are prohibited from emerging in the body.arrow_forwardThese types of T cells regulate the function of B cells, T cells, and phagocytes: a. Suppressor T cells b. Helper T cells c. Cytotoxic T cells d. None of the abovearrow_forward44) Concerning the functions of macrophages, which of the following statements is CORRECT: a. Macrophages can phagocytose pathogens and produce antibodies b. Macrophages can help T cells to stimulate complement c. Macrophages can phagocytose pathogens and are antigen presentation cells d. Macrophages activate the clotting cascade e. None of the abovearrow_forward
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