The drug mifepristone (RU-486) is a contraceptive that
a. blocks passage of sperm through the male reproductive tract.
b. blocks passage of sperm through the female reproductive tract.
c. prevents ovulation.
d. causes shedding of the endometrial lining and the implanted embryo by initiating a
menstrual period.
e. prevents implantation by blocking estrogen receptors in the uterus.
D
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When species of a single large population slowly evolves over generations into a new species, this an example of
A. adogenesis. B. cladogenesis. C. anagenesis. D. monospeciation. E. punctuated equilibrium.
Which of the following immune system components has been identified in almost all multicellular
organisms? a. bone marrow b. phagocytes c. antimicrobial peptides d. T-cells e. memory cells
Rising atmospheric concentrations of greenhouse gasses are causing which of the following two phenomena to occur?
A) global warming and global climate change B) pollution and depletion of the ozone layer C) smog and thermal inversion D) global warming and desertification E) heat and nutrient pollution
Which of the following is NOT a way that bacteria benefit humans?
A. killing harmful insects B. breaking down wastes, toxins, explosives, and petrochemicals C. production of antibiotics D. production of foodstuffs such as cheese E. transferring nutrients across intestinal membranes