NSG 552 Exam 1 V2 | NSG 552
Psychopharmacology | Actual Q&A with Rationale
(NSG 552 Exam 1) | Wilkes
1. Which neurotransmitter is primarily implicated in the regulation of the sleep-wake cycle,
mood, and appetite, and is synthesized from the amino acid L-tryptophan?
A. Dopamine
B. GABA
C. Serotonin
D. Glutamate
Correct Answer: C
Explanation: Serotonin (5-HT) is synthesized from the essential amino acid L-tryptophan
via the enzyme tryptophan hydroxylase. It plays a critical role in various physiological
functions including mood regulation, sleep patterns, and appetite control. Most
antidepressants, such as SSRIs, target the serotonin transporter to increase synaptic levels
of this neurotransmitter.
2. A patient who smokes a pack of cigarettes daily is started on Clozapine. Which
pharmacokinetic interaction should the clinician be most concerned about?
A. Induction of CYP2D6 leading to rapid metabolism
B. Inhibition of CYP3A4 leading to toxic clozapine levels
,C. Decreased renal clearance of clozapine
D. Induction of CYP1A2 leading to decreased clozapine levels
Correct Answer: D
Explanation: Cigarette smoke contains polycyclic aromatic hydrocarbons which act as
potent inducers of the CYP1A2 enzyme. Clozapine is a primary substrate for CYP1A2,
meaning its metabolism is significantly accelerated in smokers. If a patient suddenly stops
smoking while on clozapine, their serum levels can rise to toxic levels, necessitating careful
monitoring and dose adjustments.
3. Which dopamine pathway is associated with the positive symptoms of schizophrenia, such
as hallucinations and delusions, when dopamine levels are excessively high?
A. Nigrostriatal pathway
B. Tuberoinfundibular pathway
C. Mesocortical pathway
D. Mesolimbic pathway
Correct Answer: D
Explanation: The mesolimbic pathway projects from the ventral tegmental area to the
nucleus accumbens and is central to reward and emotion. Hyperactivity of dopamine in this
specific pathway is hypothesized to cause the positive symptoms of schizophrenia.
Antipsychotic medications work by blocking D2 receptors in this pathway to alleviate these
symptoms.
, 4. A drug that binds to a receptor and activates it to produce a maximal biological response is
referred to as a:
A. Partial agonist
B. Full agonist
C. Antagonist
D. Inverse agonist
Correct Answer: B
Explanation: A full agonist has high intrinsic activity and can elicit the maximum possible
response from a receptor system. This is contrasted with a partial agonist, which can only
produce a submaximal response even at 100% receptor occupancy. Understanding these
concepts is vital for predicting how different psychotropic medications will affect cellular
signaling.
5. The enzyme responsible for the conversion of Tyrosine to L-DOPA, which is the rate-
limiting step in dopamine synthesis, is:
A. Dopamine beta-hydroxylase
B. Tyrosine hydroxylase
C. Aromatic L-amino acid decarboxylase
D. Monoamine oxidase
Correct Answer: B
Psychopharmacology | Actual Q&A with Rationale
(NSG 552 Exam 1) | Wilkes
1. Which neurotransmitter is primarily implicated in the regulation of the sleep-wake cycle,
mood, and appetite, and is synthesized from the amino acid L-tryptophan?
A. Dopamine
B. GABA
C. Serotonin
D. Glutamate
Correct Answer: C
Explanation: Serotonin (5-HT) is synthesized from the essential amino acid L-tryptophan
via the enzyme tryptophan hydroxylase. It plays a critical role in various physiological
functions including mood regulation, sleep patterns, and appetite control. Most
antidepressants, such as SSRIs, target the serotonin transporter to increase synaptic levels
of this neurotransmitter.
2. A patient who smokes a pack of cigarettes daily is started on Clozapine. Which
pharmacokinetic interaction should the clinician be most concerned about?
A. Induction of CYP2D6 leading to rapid metabolism
B. Inhibition of CYP3A4 leading to toxic clozapine levels
,C. Decreased renal clearance of clozapine
D. Induction of CYP1A2 leading to decreased clozapine levels
Correct Answer: D
Explanation: Cigarette smoke contains polycyclic aromatic hydrocarbons which act as
potent inducers of the CYP1A2 enzyme. Clozapine is a primary substrate for CYP1A2,
meaning its metabolism is significantly accelerated in smokers. If a patient suddenly stops
smoking while on clozapine, their serum levels can rise to toxic levels, necessitating careful
monitoring and dose adjustments.
3. Which dopamine pathway is associated with the positive symptoms of schizophrenia, such
as hallucinations and delusions, when dopamine levels are excessively high?
A. Nigrostriatal pathway
B. Tuberoinfundibular pathway
C. Mesocortical pathway
D. Mesolimbic pathway
Correct Answer: D
Explanation: The mesolimbic pathway projects from the ventral tegmental area to the
nucleus accumbens and is central to reward and emotion. Hyperactivity of dopamine in this
specific pathway is hypothesized to cause the positive symptoms of schizophrenia.
Antipsychotic medications work by blocking D2 receptors in this pathway to alleviate these
symptoms.
, 4. A drug that binds to a receptor and activates it to produce a maximal biological response is
referred to as a:
A. Partial agonist
B. Full agonist
C. Antagonist
D. Inverse agonist
Correct Answer: B
Explanation: A full agonist has high intrinsic activity and can elicit the maximum possible
response from a receptor system. This is contrasted with a partial agonist, which can only
produce a submaximal response even at 100% receptor occupancy. Understanding these
concepts is vital for predicting how different psychotropic medications will affect cellular
signaling.
5. The enzyme responsible for the conversion of Tyrosine to L-DOPA, which is the rate-
limiting step in dopamine synthesis, is:
A. Dopamine beta-hydroxylase
B. Tyrosine hydroxylase
C. Aromatic L-amino acid decarboxylase
D. Monoamine oxidase
Correct Answer: B
