An activated TH cell produces ________, which is a growth factor for T helper cells and cytotoxic T cells.
A. complement
B. antiserum
C. interleukin-12
D. interleukin-2
E. interleukin-1
Answer: D
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What adaptation(s) persisted in the human population due to the selective pressure of humans living in larger social groups and civilizations?
a. Blushing, which signals remorse and elicits forgiveness from peers b. Tears of emotion, which shows vulnerability and increases chances of receiving help c. Disease resistance d. A&B e. B&C f. A&C g. All of the above
An ant that consumes the "honeydew" from an aphid's anus benefits by obtaining a source of carbon
a. True b. False
When scientists inserted the Bt toxin gene into plant cells they created a Select one:
a. transgenic plant. b. monohybrid. c. clone. d. stem cell. e. new species.
A sophisticated mechanism that has evolved in mammals for eliminating nitrogenous wastes involves
A) secretion through cell membranes. B) forming urea from combining ammonia with carbon dioxide C) producing uric acid and storing it in the body until it can be released. D) producing uric acid as an embryo and urea after birth.