Antibody-mediated immunity is also called:
a) cellular immunity
b) humoral immunity
c) passive immunity
d) natural immunity
Answer: b) humoral immunity
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During development in the mother's uterus, human embryos have pharyngeal pouches (sometimes called gill slits) that later develop into various glands. Fish also have pharyngeal pouches as embryos, but these develop into gills. The best explanation for why human and fish embryos develop pharyngeal pouches is
A. humans and fish share a common ancestor that had gills. B. human embryos need gill slits to breathe in the uterus. C. humans and fish both develop pharyngeal pouches by random chance. D. fish evolved from humans.
Of the following, which is used to inhibit specific enzymes in the treatment of many bacterial and viral diseases?
A) substrate analogues B) noncompetitive inhibitors C) intercalating agents D) nitrous oxide E) X-rays
A population's density is calculated as the
A) area over which the population is distributed. B) number of individuals within the population. C) unit of area divided by the number of individuals. D) number of individuals per unit area.
Which of the following is a common ailment characterized by a burning sensation caused by gastric juices backing up into the esophagus?
A) heartburn B) acidosis C) porosis D) gastritic stress