Which of the following statements is TRUE?
A) All three types of interferons have the same effect on the body.
B) Alpha interferon promotes phagocytosis.
C) Gamma interferon causes bactericidal activity by macrophages.
D) Alpha interferon acts against specific viruses.
E) Beta interferon attacks invading viruses.
C
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In 2003, the majority of AIDS deaths occurred in
A) South America. B) North America. C) Europe. D) Sub-Saharan Africa.
Which is the main antibody in secretions of exocrine glands?
a. IgA b. IgD c. IgE d. IgG e. IgM
An organism that feeds on plant or algal tissues is referred to as a(n)
A) herbivore. B) omnivore. C) carnivore. D) decomposer.
What is the physiological cause of a heart attack?
A) rupture of coronary arteries B) a blood clot moving through the heart C) a blood clot lodging in a blood vessel supplying the heart D) scar tissue in the heart muscle