The drug mifepristone (RU486)
a. is a contraceptive that blocks fertilization.
b. is more effective than birth control pills in
preventing fertilization.
c. can induce an abortion during the early weeks of
pregnancy.
d. maintains the uterine lining
e. includes all of these
Answer: c
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Root nodules and legumes are a good example of a(n)
a. symbiotic relationship. b. amensalistic relationship. c. commensal relationship. d. parasitic relationship. e. abiotic relationship.
The quick response of the immune system to a second infection is due to
A. activation of macrophage cells. B. suppression of suppressor cells. C. T and B memory cells. D. high levels of antigen. E. new cytotoxic T cells.
Pili are involved in adhesion of bacterial cells to a substrate or host, or in transmission of __________
between bacteria. a. ribosomes b. cytoplasm c. vectors d. RNA e. DNA
The primary nitrogen-containing compound excreted by our kidneys is __________.
a. uric acid b. amino acids c. ammonia d. urea e. nitrite