BIOLOGY 12TH ED (LL) W/ CONNECT
BIOLOGY 12TH ED (LL) W/ CONNECT
12th Edition
ISBN: 9781264898091
Author: Raven
Publisher: MCG
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Chapter 50, Problem 7U

Suppose that a new disease is discovered that suppresses the immune system. Which of the following would indicate that the disease specifically affects the B cells rather than the helper or cytotoxic T cells?

a. A decrease in the production of interleukin-2

b. A decrease in interferon production

c. A decrease in the number of plasma cells

d. A decrease in the production of interleukin-1

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Suppose a person recovers normally from viral infections, but then gets the same viral infections over and over again- unlike the rest of us.  A. What is probably wrong –B cells, helper T cells and/or cytotoxic T cells? B. Should this person be at a higher risk of cancer than the rest of us?  C. Should this person be able to lyse bacterial cells as well as the rest of us? D. Should this person tolerate a graft (from an unreated person) better than you are me?
Explain why each choice (a-d) is correct or incorrect. In clonal selection of B cells, which substance is responsible for determining which cells will eventually become clones? a. Antigen b. Interferon c. Antibody d. Complement
Explain 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.

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BIOLOGY 12TH ED (LL) W/ CONNECT

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