A substance that blocks receptor sites so that the illicit drug does not produce an effect is called

Studies on long-term memory in elderly people usually show that

a. elderly people show substantial deficits in implicit memory. b. elderly people and young adults perform similarly on all the major tests of long-term memory. c. elderly people are usually somewhat better than young adults in recalling people's names. d. in manyâ€"but not allâ€"areas, young adults and elderly adults perform similarly.

What are endophenotypes?

A. Abnormally shaped cells in the brain B. Neurotransmitters of slightly different chemical composition than normal C. Discrete, stable, and measurable traits thought to be under genetic control D. Specific chromosomes thought to be important in the genetic transmission of schizophrenia