Mechanical barriers include:
A. sweat, tears, and stomach acid
B. phagocytes and natural killer cells
C. antibodies (immunoglobulins)
D. skin and mucous membranes
Ans: D. skin and mucous membranes
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Choose the letter of the best match: Prevention of egg maturation and ovulation
A. birth control pill B. intrauterine device C. diaphragm D. foams and jellies E. vasectomy
In which organism is genetically engineered human insulin produced?
a. pigs b. E. coli c. humans d. T. aquaticus e. B. thuringiensis
Which of the following is a hominin?
a. chimpanzee b. Australopithecus c. baboon d. bonobo e. gorilla
Lyme disease becomes chronic because
A) Borrelia changes its surface antigens frequently. B) Borrelia can lie dormant in liver cells. C) the bacterium resists phagocytosis. D) Borrelia is an intracellular parasite of erythrocytes. E) the bacterium resists phagocytosis and "hides" erythrocytes.