To what disease do individuals heterozygous
for cystic fibrosis have increased resistance?
a. hemophilia
b. Tay-Sachs
c. typhoid
d. diptheria
e. cholera
C
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Which of the following is a cause of drug-specific resistance in disease-causing organisms?
A) inappropriate hygiene B) nosocomial infection C) poor immunity D) indiscriminate nonmedical use of antimicrobials
Autoimmune diseases result from a breakdown in the ability of the body to
a. produce antibodies. b. produce memory cells. c. destroy major histocompatibility proteins. d. distinguish self from non-self. e. distinguish between harmless and pathogenic microorganisms.
Iron is required for primary production. Which of the following is correct to predict?
a. Iron fertilization of oceans can raise N2 in the atmosphere. b. Iron fertilization of oceans can lower O2 in the atmosphere. c. Iron fertilization of oceans can raise CO2 in the atmosphere. d. Iron fertilization of oceans can lower CO2 in the atmosphere.
Which statement regarding birth control is true?
A) The most widely used birth control pills contain a combination of FSH and LH. B) Natural family planning is generally reliable. C) Morning-after pills taken within 3 days of unprotected intercourse prevent fertilization or implantation about 75% of the time. D) Birth control pills work primarily by preventing fertilization and implantation.