The cell type responsible for contact dermatitis and tissue rejection is:
A. cytotoxic T cells
B. Th1 cells
C. CD8 cells
D. CD4 cells
Answer: B. Th1 cells
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A hot tub (approx. 104?F or 40?C) would most likely contain
A. psychrophiles. B. partiers. C. thermophiles. D. mesophiles.
The process of ____ is the transfer of heat from a body to a fluid that passes over its surface
a. conduction b. radiation c. evaporation d. convection e. radiative cooling
Typically, where would the oldest fossils be found?
a. superficial layer of the Earth b. deep layer of the Earth c. on the ocean floor d. in lake beds e. on mountaintops
The ability of some bacteria to produce lactate is exploited by humans to make:a
cheese and ethyl alcohol. b. insulin and antibodies. c. yogurt and sauerkraut. d. ethyl alcohol and carbonic acid. e. carbon dioxide and water