Campbell Biology:conc.(ll)-w/access
9th Edition
ISBN: 9780134784427
Author: Reece
Publisher: PEARSON
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Textbook Question
Chapter 24, Problem 4TYK
Which of the following best describes the difference in the way B cells and cytotoxic T cells deal with invaders?
a. B cells confer active immunity; T cells confer passive immunity.
b. B cells send out antibodies to attack; certain T cells can do the attacking themselves.
c. T cells handle the primary immune response; B cells handle the secondary response.
d. B cells are responsible for the cell-mediated immune response; T cells are responsible for the humoral immune response.
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Decreased immunity is a symptom of HIV/AIDS. This is caused by which of the following?
Select one:
a. HIV destroys antigens. This decreases the possibility of recognizing pathogens in the future.
b. HIV destroys memory T cells. If the body is infected again, there is no antibodies to fight an infection.
c. HIV attacks the macrophages. Pathogens cannot be destroyed once they enter the body.
d. HIV attacks the helper T cells. This allows pathogen cells to enter the body unnoticed.
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.
An antigen-presenting cell (APC)a. presents antigens to T cells.b. secretes antibodies.c. marks each human cell as belonging to that person.d. secretes cytokines only.
Chapter 24 Solutions
Campbell Biology:conc.(ll)-w/access
Ch. 24 - Complete this concept map to summarize the key...Ch. 24 - Foreign molecules that elicit an immune response...Ch. 24 - Which of the following is not part of the...Ch. 24 - Which of the following best describes the...Ch. 24 - Prob. 5TYKCh. 24 - Prob. 6TYKCh. 24 - Prob. 7TYKCh. 24 - Prob. 8TYKCh. 24 - Prob. 9TYKCh. 24 - Which of the following statements is not true? a....
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- The T-cell antigen receptor is similar to immunoglobulin molecules in that it: a. can cross the placenta and provide protection to a fetus b. remains bound to the cell surface and is never secreted c. binds complement d. contains V and C regions on each of its chainarrow_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_forwardExplain why each choice (a-d) is correct or incorrect. Which statement is true about T cells? a. They usually directly recognize antigens, which then activates a subpopulation of killer cells b. Their proliferation is enhanced by interleukins 1 and 2. c. Once activated, they cannot secrete cytokines. d. They will develop into cytotoxic T cells if antigen is complexed with class II MHC proteins.arrow_forward
- Humoral immunity is the part of the adaptive immune system involving: A.cytotoxic T cells killing infected host cells B.neutrophils eating bacteria C.B cells making antibodies to target the invading pathogen D.Your skin cells protecting you from infection with the acidic pH on the surfacearrow_forwardWhich 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_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_forward
- Ibuprofen 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_forwardWhich of the following is not important in the antiviral innate immune response?a. interferonsb. natural killer cellsc. complementd. microphagesarrow_forwardWhich 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_forward
- What is the function of cytotoxic T-cells? Select one: a. They are long lived cells that provide life long immunity b. They kill cells that have the antigen they recognize c. They pump out chemical weapons & stimulate other T & B cells d. They produce and secrete antibodiesarrow_forwardWhat are the roles of the innate immune system? Select all that apply. A. identity self vs. non-self B. provide a physical barrier to infection C. initiate inflammation D. suppress proliferation E. call for help from the adaptive immune system F. circulate fluids through the lymphatic systemarrow_forwardWhich of the following explains why dendritic cells, but not macrophages or B cells, contribute to the activation of naive T cells? a. Macrophages and B cells do not express MHC class II molecules until they are activated. b. Dendritic cells upregulate B7 after engaging innate immunity receptors at sites of infection. c. Dendritic cells express higher levels of CTLA4. d. Macrophages and B cells do not process antigen. e. Dendritic cells use Toll-like receptors to hold antigen in place for extended periods of time.arrow_forward
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