In which phase of clinical trials is an experimental drug administered to volunteers to identify possible side effects and determine patterns of absorption and elimination?

A device that measures electrical activity in the brain over time by the means of recording electrodes attached to the surface of the skin is

a. a CT scan. b. electroencephalograph. c. an MRI. d. an fMRI.

Tay-Sachs disease, which produces severe motor and sensory disabilities, intellectual disability, and death at age 2 to 4 years, is found especially in

a. European Americans. b. Hasidic Jews. c. Ashkenazi Jews. d. Australian Americans.