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
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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.
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.
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
Refer to the accompanying figure. Which label denotes the nerve cord?
a. 1
b. 2
c. 3
d. 5
e. 6