The primary feature of a neuron that prevents the action potential from traveling back from where it just passed is the ____.
A. concentration gradient
B. refractory period
C. sodium potassium pump
D. phospholipid bilayer
Answer: B
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Preconception sperm sorting and pre-implantation genetic diagnosis are two methods of ______.
A. surrogacy B. gene therapy C. gender modification D. sex selection
Warren has a psychological disorder, and clinicians who are working on the case ordered an MRI. The images from the MRI show that the ventricles in Warren's brain are larger than those typically seen in patients without a psychological disorder. In this case, Warren is likely to be diagnosed as having:
a. major depression b. bipolar disorder c. Alzheimer's disease d. schizophrenia
Because taking a drug reduces withdrawal symptoms, taking the drug is
a. negatively reinforced. b. positively reinforced. c. vicariously reinforced. d. extinguished.
Your roommate is staying in bed all day and missing classes. She is sleeping all day but then wakes up frequently in the middle of the night. When she does get up, she is very irritable. When she goes to dinner, she says that nothing on the menu sounds good, and she ends up eating snack foods all the time. She has difficulty concentrating and has lost interest in hobbies that she used to enjoy. What might be going on with her?
A. She might have bipolar disorder and should get medication. B. She might be depressed and should definitely see a doctor for a diagnosis. C. She might be coming down with schizophrenia and should see a doctor before it gets worse. D. She is just homesick and will be fine as soon as she gets over it.