MCAT Behavioral Sciences Question 105: Answer and Explanation
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Question: 105
15. Which of the following is true regarding bipolar disorders?
I. They have little, if any, genetic heritability.
II. They are associated with increased levels of serotonin in the brain.
III. They all require at least one depressive episode for diagnosis.
- A. I only
- B. II only
- C. I and III only
- D. II and III only
Correct Answer: B
Explanation:
Bipolar disorders have been shown to be highly heritable and are associated with increased levels of norepinephrine and serotonin in the brain. Bipolar I disorder can be diagnosed with a single manic episode and does not require a major depressive episode. Bipolar II disorder requires at least one hypomanic episode and one major depressive episode. Cyclothymic disorder contains at least one hypomanic episode and dysthymia.