A potent dicot weed killer, 2,4-D, is actually a synthetic
a. phytochrome.
b. gibberellin.
c. auxin.
d. cytokinin.
e. abscisic acid.
C
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Which of the following may be transmitted by saliva?
A. infectious mononucleosis B. Dengue fever C. plague D. yellow fever
___________, such as sea stars, are invertebrate
members of the deuterostome lineage. Fill in the blank(s) with the appropriate word(s).
Electrons are ejected from atoms in cells when organisms are exposed to ________.
A. desiccation B. ultraviolet light C. hydrogen peroxide D. ethyl alcohol E. gamma rays and X rays
Which of the following does not contribute to limits on population growth?
a. snakes feeding on mice in a cornfield b. bears having two cubs c. the amount of light for photosynthesis d. a disease-causing organism entering a population e. an increase in the total rainfall in a normally dry environment