Why do children with PKU develop intellectual disabilities?
A. Unmetabolized amino acids accumulate and affect the brain.
B. Essential axons lack myelin sheaths.
C. Dendrites and synapses fail to form in associative areas of the cortex.
D. Their immune systems do not fight off brain infections.
Answer: A
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Some teenagers experience negative life events and do not become depressed. Which of the following teenagers is LEAST likely to become depressed when she experiences a negative life event?
a. Crystal, who already sees herself in a negative light b. Cameron, who tends to blame herself when things go wrong c. Celia, whose parents are distant and uninvolved with her d. Carmine, who is effective in regulating her emotions
The tendency for a new sexual partner to be arousing (more arousing than a familiar sexual partner) is known as ____
a. the Coolidge effect b. excitation transfer theory c. broaden-and-build theory d. erotic plasticity
Based on gender and ethnicity, which of the following persons is most likely to have red-green color weakness?
a. Sam, a Native American male b. Jake, a Caucasian male c. Robert, an African-American male d. Suki, an Asian female
Medications for erectile dysfunction interact with a. testosterone. b. vasopressin. c. oxytocin
d. nitric oxide.