You arrive back in the United States after a visit to a foreign country located on another continent. The customs agent stops the person in front of you and confiscates the fruit basket this person is bringing home. Being the knowledgeable person you
are, you calmly explain to your enraged fellow traveler that the reason for the detainment is that the fruit basket may be
A) carrying endangered fruit.
B) carrying an exotic species that could damage North American ecosystems.
C) contaminated with chemicals that will damage the ozone layer above North America.
D) contaminated with sufficient DDT to cause serious harm to anyone who eats the fruit.
Answer: B
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All of the following are the result of B cell maturation and activation EXCEPT
A. antibody is produced. B. macrophages are activated. C. plasma cells are produced. D. memory cells are produced.
The growth rate of a population per unit of time is calculated by using this formula: G = r x N. What is the quantity r and how is it calculated?
a. The quantity r is the exponential growth rate and is calculated by subtracting the number of deaths from the number of births. b. The quantity r is the per capita growth rate and is calculated by multiplying the number of births and the number of deaths. c. The quantity r is the per capita growth rate and is calculated by subtracting the number of deaths from the number of births. d. The quantity r is the biotic potential of a population and is calculated by adding the birth rate and the death rate. e. The quantity r is the monthly net increase of a population and is calculated by subtracting the number of births from the starting population size.
Scientists have proposed a number of mechanisms by which the xylem carries water to the tops of the highest trees. Which of the proposed mechanisms is the correct one?
a. capillary action b. guttation c. transpiration d. root pressure e. xylem pumps
Ecdysone, or chemicals that mimic ecdysone, are sometimes used as ____
a. insecticides b. fungicides c. herbicides d. fungicides and nematocides e. fertilizers