Antidepressant drugs increase the availability of serotonin, dopamine, or other neurotransmitters in the synapses. Why is it nevertheless unlikely that this effect fully explains the benefits of the drugs?
What will be an ideal response?
Antidepressant drugs produce their effects on the neurotransmitters within an hour or so, but in most cases they show no behavioral benefits until someone has taken the drugs for two to three weeks. Evidently the benefits depend on something that develops more gradually, such as the birth of new neurons in the hippocampus.
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Which of the following statements is true regarding prenatal sex differentiation?
A) Sex differentiation begins at around 4 to 8 weeks of gestation. B) If androgens are present, female genitalia develop regardless of the chromosomal makeup of the fetus. C) In the absence of the SRX gene, an XY fetus will develop female genitalia. D) The absence of a Y chromosome will ensure the development of male genitalia.
Which of the following is true of a trait that is passed through mitochondrial inheritance?
A) It is inherited as a multifactorial trait. B) It is passed from a mother to her children. C) It is found only on the Y chromosome. D) It is a co-dominant trait.