A potent dicot weed killer, 2,4-D, is actually a synthetic

a. phytochrome.
b. gibberellin.
c. auxin.
d. cytokinin.
e. abscisic acid.


C

Biology & Microbiology

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Which of the following may be transmitted by saliva?

A. infectious mononucleosis B. Dengue fever C. plague D. yellow fever

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___________, such as sea stars, are invertebrate

members of the deuterostome lineage. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

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

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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

Biology & Microbiology