What Is Life? A Guide to Biology with Physiology
4th Edition
ISBN: 9781319065447
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 27, Problem 8MC
Summary Introduction
Introduction:
Helper T cells play a central role in helping in the functions of other immune cells.
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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.
Explain 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.
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.
Chapter 27 Solutions
What Is Life? A Guide to Biology with Physiology
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Similar questions
- Which of these statements about T lymphocytes is false? a. Saome T cells promote the activity of B cells. b. Some T cells suppress the activity of B cells. c. Some T cells secrete interferon. d. Some T cells produce antibodies.arrow_forwardWhich of the following is NOT true about T cells?(a) T cells develop from lymphoid stem cells in the bonemarrow and mature in the thymus.(b) Cell-mediated immunity is primarily carried out by Tcells.(c) Subsequent differentiation of T cells produces cytotoxic(killer) T cells, delayed-hypersensitivity T cells, helper Tcells, and regulatory T cells.(d) Natural killer cells (NK) are exclusively differentiated Tcells.(e) T cells act in situations where antigens are embeddedin cell membranes or are inside host cells and thus areinaccessible to antibodies.arrow_forwardIbuprofen dampens the immune system’s inflammation response.What might be a short-term consequence of taking ibuprofen?a. Blood vessels may become less permeable.b. Antibodies may become less active.c. Cytotoxic T cells may begin to divide.d. All of the above are correctarrow_forward
- What type of cells secrete antibodies? A) Cytotoxic T cells B) Helper T cells C) B cells D) Plasma cells E) Antigen-presenting cellsarrow_forwardWhich of the following does not occur during a secondary immuneresponse?a. Antibodies are made quickly and in great amounts.b. Antibody production lasts longer than in a primary response.c. Clonal selection occurs for B cells.d. All of these are correct.arrow_forwardMark the following statements as true or false. If a statement is false, correct is to make a true statement. a. In the primary immune response, the lag phase lasts about 5 days, during which time B cells proliferate and differentiate. b. The secondary immune response is mediated by plasma cells. c. Subunit vaccines consist of pathogens that are alive but unable to cause disease. d. Vaccinations are given to induce the production of the inflammatory responsearrow_forward
- 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_forwardWhich 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_forwardA drug that were to inhibit the activity of T suppressor cells would lead to _______. a. decreased activity of T cells b. increase in infection c. increase activation of B cells no responsearrow_forward
- In a normal individual, a T cell that interacts with a self-antigen in the thymus will more than likely undergo what process (which answer is best)? A) apoptosis B) release granules C) activation D) extravasation E) anergyarrow_forwardWhich 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.arrow_forwardWhich of the choices is required to activate a helper T cell, which in turn can stimulate antibody production by B cells? A)An antibody displayed by a major histocompatibility complex protein B)A major histocompatibility complex protein alone C)An antigen displayed by a major histocompatibility complex protein D)An antigen alonearrow_forward
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