Taking one drug can often produce tolerance to other drugs; such tolerance is called

Suppose a researcher is studying twins where at least one twin suffers from depression. The researcher finds that both twins are much more likely to share the disorder if they are monozygotic and not dizygotic twins. What should the research conclude?

A) depression is entirely genetic B) the heritability of depression is high C) the heritability of depression is low D) monozygotic twins are at a higher risk for depression than non-twins

What is a consequence of the properties of bitter receptors? a. Because bitter receptors are heat-sensitive, all hot foods taste somewhat bitter

b. Because bitter receptors increase with age, old people reject many foods. c. Because bitter receptors cluster in one spot, a food's taste depends on where you chew it. d. Because we have many types of bitter receptor, we do not taste low bitter concentrations.