NR 546 Week 1 Exam V3 | NR 546 Advanced
Pharmacology Psychopharmacology for the
PMHNP | Actual Q&A with Rationale (NR546 Week
1 Exam) | Chamberlain University
1. Which term describes what the drug does to the body, including receptor binding and
signal transduction?
A. Pharmacodynamics
B. Pharmacokinetics
C. Bioavailability
D. Pharmacogenomics
Correct Answer: A
Explanation: Pharmacodynamics is the study of the biochemical and physiological effects
of drugs on the body. This includes the mechanisms of drug action and the relationship
between drug concentration and effect. It is a core concept in advanced
psychopharmacology used to predict how a patient will respond to a medication.
2. A patient is prescribed a medication that acts as a full agonist. What does this imply about
the drug’s activity?
A. It blocks the receptor from any activity.
B. It produces a submaximal response compared to the endogenous ligand.
C. It produces a maximal biological response by mimicking the endogenous ligand.
,D. It produces the opposite effect of the natural ligand.
Correct Answer: C
Explanation: A full agonist binds to a receptor and activates it to the maximum extent
possible. This results in the highest level of biological response associated with that
receptor type. The PMHNP must understand this to distinguish between full, partial, and
inverse agonists.
3. What is the primary function of the Cytochrome P450 3A4 (CYP3A4) enzyme?
A. To facilitate the reuptake of serotonin in the synaptic cleft.
B. To act as a second messenger in G-protein coupled receptor systems.
C. To metabolize approximately 50% of all clinically used medications.
D. To regulate the voltage-gated sodium channels in the axon.
Correct Answer: C
Explanation: CYP3A4 is the most prevalent enzyme in the liver and is responsible for
metabolizing about half of all prescribed drugs. Because it handles so many medications, it
is a frequent site for drug-drug interactions. Monitoring for inhibitors or inducers of this
enzyme is critical for patient safety.
4. Which neurotransmitter is considered the primary excitatory neurotransmitter in the
central nervous system?
A. GABA
, B. Serotonin
C. Dopamine
D. Glutamate
Correct Answer: D
Explanation: Glutamate is the main excitatory neurotransmitter in the brain, essential for
neuroplasticity and learning. It works through both ionotropic and metabotropic receptors
to increase neuronal firing. Excessive glutamate activity is often linked to excitotoxicity and
various psychiatric conditions.
5. When a patient smokes cigarettes, which CYP450 enzyme is induced, potentially lowering
the blood levels of medications like Olanzapine?
A. CYP2D6
B. CYP1A2
C. CYP3A4
D. CYP2C19
Correct Answer: B
Explanation: Polycyclic aromatic hydrocarbons in cigarette smoke induce the CYP1A2
enzyme. This induction leads to increased metabolism and decreased plasma
concentrations of drugs that are substrates of 1A2, such as olanzapine and clozapine.
PMHNPs must adjust dosages if a patient starts or stops smoking.
Pharmacology Psychopharmacology for the
PMHNP | Actual Q&A with Rationale (NR546 Week
1 Exam) | Chamberlain University
1. Which term describes what the drug does to the body, including receptor binding and
signal transduction?
A. Pharmacodynamics
B. Pharmacokinetics
C. Bioavailability
D. Pharmacogenomics
Correct Answer: A
Explanation: Pharmacodynamics is the study of the biochemical and physiological effects
of drugs on the body. This includes the mechanisms of drug action and the relationship
between drug concentration and effect. It is a core concept in advanced
psychopharmacology used to predict how a patient will respond to a medication.
2. A patient is prescribed a medication that acts as a full agonist. What does this imply about
the drug’s activity?
A. It blocks the receptor from any activity.
B. It produces a submaximal response compared to the endogenous ligand.
C. It produces a maximal biological response by mimicking the endogenous ligand.
,D. It produces the opposite effect of the natural ligand.
Correct Answer: C
Explanation: A full agonist binds to a receptor and activates it to the maximum extent
possible. This results in the highest level of biological response associated with that
receptor type. The PMHNP must understand this to distinguish between full, partial, and
inverse agonists.
3. What is the primary function of the Cytochrome P450 3A4 (CYP3A4) enzyme?
A. To facilitate the reuptake of serotonin in the synaptic cleft.
B. To act as a second messenger in G-protein coupled receptor systems.
C. To metabolize approximately 50% of all clinically used medications.
D. To regulate the voltage-gated sodium channels in the axon.
Correct Answer: C
Explanation: CYP3A4 is the most prevalent enzyme in the liver and is responsible for
metabolizing about half of all prescribed drugs. Because it handles so many medications, it
is a frequent site for drug-drug interactions. Monitoring for inhibitors or inducers of this
enzyme is critical for patient safety.
4. Which neurotransmitter is considered the primary excitatory neurotransmitter in the
central nervous system?
A. GABA
, B. Serotonin
C. Dopamine
D. Glutamate
Correct Answer: D
Explanation: Glutamate is the main excitatory neurotransmitter in the brain, essential for
neuroplasticity and learning. It works through both ionotropic and metabotropic receptors
to increase neuronal firing. Excessive glutamate activity is often linked to excitotoxicity and
various psychiatric conditions.
5. When a patient smokes cigarettes, which CYP450 enzyme is induced, potentially lowering
the blood levels of medications like Olanzapine?
A. CYP2D6
B. CYP1A2
C. CYP3A4
D. CYP2C19
Correct Answer: B
Explanation: Polycyclic aromatic hydrocarbons in cigarette smoke induce the CYP1A2
enzyme. This induction leads to increased metabolism and decreased plasma
concentrations of drugs that are substrates of 1A2, such as olanzapine and clozapine.
PMHNPs must adjust dosages if a patient starts or stops smoking.
