The diversity of our native grassland species is in decline. Restoration ecologists working to restore native grasslands are experimenting with combinations of burning and grazing to simulate natural conditions and increase species diversity
According to Joseph Connell,
what level of burning and grazing should ecologists aim for?
A. Strong enough to limit interspecific
competition, but not strong enough to limit the
number of species that can tolerate the
environment.
B. Strong enough to promote interspecific
competition and niche diversification, but not
strong enough to promote competitive
exclusion.
C. Strong enough to promote indirect
competition, but not strong enough to
promote direct competition.
D. Strong enough to selectively favor one or
more keystone species, but not strong
enough to favor their competitors.
E. None of these.
A
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Which ethical dilemma may arise from the application of pharmagogenomics?
a. The use of embryonic stem cells for gene therapy. b. The discovery of a gene that predicts an unfavorable drug response in an individual, for whom there are no alternative treatments available. c. The use of vaccination to prevent diseases. d. The use of blood transfusions to treat diseases. e. The introduction of foreign genes to restore loss of vital gene function in a patient with an infectious disease.
Where do global air circulation patterns begin?
a. At 60o N b. At 30o S c. At the equator d. At 30o N e. At the poles
Which of the following serves to end the menstrual
cycle? a. a surge in luteinizing hormone b. the secretion of human chorionic gonadotropin c. the breakdown of the corpus luteum d. a rise in the level of progesterone e. a drop in the level of gonadotropic hormones in the blood
When speciation occurs, the result is usually a dramatic change in appearance in the new species
Indicate whether the statement is true or false