A student's organized set of expectations about how a college professor is supposed to act is an example of a

A single-blind study means that

a. the researcher will not know who is in which group. b. researcher expectations will not affect the results. c. only one independent variable will be manipulated. d. drugs will be used. e. participant expectations will not be different between groups.

Opiates exert their powerful effect on the body by

a. releasing hormones. b. stimulating the release of dopamine. c. mimicking neuromodulators. d. blocking the reuptake of serotonin. e. mimicking proteins.