Phenylketonuria, Tay-Sachs disease, Hurler syndrome, and Lesch-Nyhan syndrome are all included in the same section of your textbook because they are all
a. mild forms of intellectual disability.
b. prevalent only in boys.
c. caused by recessive gene pairings.
d. linked to chromosome 21.
Answer: c.
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Lyle is 23 years old. His mother died two weeks ago, and since then he has been so upset that he has unable to eat or sleep. He has been crying a great deal. The death was completely unexpected, and Lyle has been alternating between feeling sad, to feeling very anxious, and to wanting to deny that his mother is dead. Lyle appears to be experiencing
a. rapid cycling bipolar disorder. b. a major depressive episode. c. double depression. d. grief.
A researcher tests a new antidepressant drug. The drug works, but not for the theoretical
reasons proposed in the researcher's hypothesis. The experiment lacks ______ validity. a. face c. internal b. construct d. external