NR 546 Week 3 Exam V1 | NR 546 Advanced
Pharmacology Psychopharmacology for the
PMHNP | Actual Q&A with Rationale (NR546 Week
3 Exam) | Chamberlain University
1. A PMHNP is studying signal transduction and understands that the primary function of a G-
protein-linked receptor is to:
A. Act as a pore for ion movement
B. Directly facilitate the reuptake of monoamines
C. Convert extracellular signals into intracellular second messengers
D. Inhibit the action of protein kinases
Correct Answer: C
Explanation: G-protein-linked receptors are transmembrane proteins that translate
chemical signals from outside the cell into actions inside the cell. When a neurotransmitter
binds to the receptor, it activates the G-protein, which then stimulates second messenger
systems like cAMP. This cascade eventually leads to changes in gene expression and
neuronal function, which is fundamental to psychopharmacology.
2. When considering the mechanism of action for most antipsychotics and antidepressants,
which phase of signal transduction is most critical for therapeutic effect?
A. The first messenger binding only
B. The immediate opening of ion channels
,C. The third and fourth messenger downstream cascades
D. The passive diffusion of the drug into the nucleus
Correct Answer: C
Explanation: While the first messenger (neurotransmitter) binding is the initial step, the
long-term therapeutic effects of psychotropic medications are thought to result from
downstream cascades. These involve third and fourth messengers that alter gene
expression and neuroplasticity over several weeks. This delay in molecular change explains
why many psychiatric medications take time to show clinical efficacy.
3. Glutamate is the brain’s primary excitatory neurotransmitter. Which receptor type does it
primarily activate to facilitate fast excitatory neurotransmission?
A. NMDA and AMPA receptors
B. GABA-A receptors
C. Muscarinic receptors
D. 5-HT2A receptors
Correct Answer: A
Explanation: Glutamate acts on ionotropic receptors, specifically NMDA, AMPA, and
kainate receptors, to allow the influx of cations like sodium and calcium. This influx leads to
depolarization and the propagation of an action potential. Understanding these receptors is
vital as they are targets for drugs treating Alzheimer’s and other cognitive disorders.
, 4. The PMHNP understands that the Cytochrome P450 (CYP450) enzyme system is responsible
for the metabolism of many psychotropic drugs. What happens when a patient is a ‘Poor
Metabolizer’ of CYP2D6?
A. The patient will require higher doses to achieve therapeutic levels.
B. The patient is at risk for drug toxicity due to higher serum levels.
C. The drug will be cleared from the body faster than normal.
D. There is no clinical significance for psychiatric treatment.
Correct Answer: B
Explanation: Poor metabolizers lack the enzymatic activity needed to break down drugs
processed by a specific CYP pathway, such as CYP2D6. This leads to higher-than-expected
drug concentrations in the blood, increasing the risk of adverse effects and toxicity.
Clinicians must adjust doses downward or choose alternative medications for these
patients.
5. Which of the following describes the ‘constitutive activity’ of a receptor?
A. Activity that only occurs in the presence of an agonist
B. The maximum response an antagonist can elicit
C. The baseline level of signaling that occurs without any ligand present
D. The rapid desensitization of a receptor after prolonged use
Correct Answer: C
Pharmacology Psychopharmacology for the
PMHNP | Actual Q&A with Rationale (NR546 Week
3 Exam) | Chamberlain University
1. A PMHNP is studying signal transduction and understands that the primary function of a G-
protein-linked receptor is to:
A. Act as a pore for ion movement
B. Directly facilitate the reuptake of monoamines
C. Convert extracellular signals into intracellular second messengers
D. Inhibit the action of protein kinases
Correct Answer: C
Explanation: G-protein-linked receptors are transmembrane proteins that translate
chemical signals from outside the cell into actions inside the cell. When a neurotransmitter
binds to the receptor, it activates the G-protein, which then stimulates second messenger
systems like cAMP. This cascade eventually leads to changes in gene expression and
neuronal function, which is fundamental to psychopharmacology.
2. When considering the mechanism of action for most antipsychotics and antidepressants,
which phase of signal transduction is most critical for therapeutic effect?
A. The first messenger binding only
B. The immediate opening of ion channels
,C. The third and fourth messenger downstream cascades
D. The passive diffusion of the drug into the nucleus
Correct Answer: C
Explanation: While the first messenger (neurotransmitter) binding is the initial step, the
long-term therapeutic effects of psychotropic medications are thought to result from
downstream cascades. These involve third and fourth messengers that alter gene
expression and neuroplasticity over several weeks. This delay in molecular change explains
why many psychiatric medications take time to show clinical efficacy.
3. Glutamate is the brain’s primary excitatory neurotransmitter. Which receptor type does it
primarily activate to facilitate fast excitatory neurotransmission?
A. NMDA and AMPA receptors
B. GABA-A receptors
C. Muscarinic receptors
D. 5-HT2A receptors
Correct Answer: A
Explanation: Glutamate acts on ionotropic receptors, specifically NMDA, AMPA, and
kainate receptors, to allow the influx of cations like sodium and calcium. This influx leads to
depolarization and the propagation of an action potential. Understanding these receptors is
vital as they are targets for drugs treating Alzheimer’s and other cognitive disorders.
, 4. The PMHNP understands that the Cytochrome P450 (CYP450) enzyme system is responsible
for the metabolism of many psychotropic drugs. What happens when a patient is a ‘Poor
Metabolizer’ of CYP2D6?
A. The patient will require higher doses to achieve therapeutic levels.
B. The patient is at risk for drug toxicity due to higher serum levels.
C. The drug will be cleared from the body faster than normal.
D. There is no clinical significance for psychiatric treatment.
Correct Answer: B
Explanation: Poor metabolizers lack the enzymatic activity needed to break down drugs
processed by a specific CYP pathway, such as CYP2D6. This leads to higher-than-expected
drug concentrations in the blood, increasing the risk of adverse effects and toxicity.
Clinicians must adjust doses downward or choose alternative medications for these
patients.
5. Which of the following describes the ‘constitutive activity’ of a receptor?
A. Activity that only occurs in the presence of an agonist
B. The maximum response an antagonist can elicit
C. The baseline level of signaling that occurs without any ligand present
D. The rapid desensitization of a receptor after prolonged use
Correct Answer: C
