Cytotoxic T-cells

A. lack specificity for a target cell.
B. secrete interleukin-2 to stimulate B and T-cells.
C. stimulate B-cell proliferation.
D. secrete granzymes and perforins that damage target cells.
E. All of these choices are correct.


Answer: D

Biology & Microbiology

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The carbon source for a heterotroph is

a. breathing carbon dioxide from the air. b. water. c. sunlight. d. ingesting organic matter. e. various inorganic molecules found in all ecosystems.

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Answer the following statements true (T) or false (F)

1.A transfusion can provide passive immunity. 2.If an Rh- woman has two babies who are Rh+, her immune response to the second baby would be an example of a secondary immune response. 3.T cells direct humoral immunity while B cells govern cell-mediated immune reactions. 4.Lymph nodes have a crucial role in immunity. 5.Adaptive immune defenses provide a rapid, broad defense against any infectious agent.

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The ability to meet humanity's current needs without compromising the ability of future generations to

meet their needs is: a. environmental sustainability. b. species richness. c. biosphere diversity. d. resource conservation. e. habitat regeneration

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Refer to the accompanying figure. Which label denotes the nerve cord?


a. 1
b. 2
c. 3
d. 5
e. 6

Biology & Microbiology