NR 546 Week 2 Exam V1 | NR 546 Advanced
Pharmacology Psychopharmacology for the
PMHNP | Actual Q&A with Rationale (NR546 Week
2 Exam) | Chamberlain University
1. Which enzyme is responsible for the rate-limiting step in the synthesis of dopamine?
A. DOPA decarboxylase
B. Tyrosine hydroxylase
C. Dopamine beta-hydroxylase
D. Monoamine oxidase
Correct Answer: B
Explanation: Tyrosine hydroxylase is the rate-limiting enzyme that converts tyrosine into
L-DOPA. This step determines the overall rate of catecholamine production within the
neuron. Inhibiting this enzyme would significantly decrease the levels of dopamine,
norepinephrine, and epinephrine.
2. What is the primary inhibitory neurotransmitter in the central nervous system?
A. Glutamate
B. Glycine
C. GABA
D. Acetylcholine
,Correct Answer: C
Explanation: Gamma-aminobutyric acid (GABA) is the most abundant inhibitory
neurotransmitter in the brain. It works by increasing chloride conductance into the neuron,
which hyperpolarizes the cell and reduces excitability. Medications such as
benzodiazepines enhance the effects of GABA to produce calming results.
3. A patient is taking a medication that acts as a partial agonist at the D2 receptor. What does
this imply?
A. It will always block all dopamine activity.
B. It will trigger a maximal biological response similar to dopamine.
C. It will act as an antagonist in high-dopamine environments and an agonist in low-
dopamine environments.
D. It binds to the receptor but has no intrinsic activity.
Correct Answer: C
Explanation: Partial agonists, like aripiprazole, have intrinsic activity that is lower than a
full agonist but greater than zero. In areas of the brain where dopamine is excessive, the
partial agonist acts as an antagonist by competing for receptors. Conversely, in areas where
dopamine is low, it provides a moderate level of stimulation to normalize signaling.
4. The NMDA receptor is a subtype of which neurotransmitter system?
A. Serotonin
B. Norepinephrine
, C. Acetylcholine
D. Glutamate
Correct Answer: D
Explanation: The N-methyl-D-aspartate (NMDA) receptor is a ligand-gated ionotropic
receptor for glutamate. It plays a critical role in synaptic plasticity and memory formation
due to its permeability to calcium. Dysfunction in NMDA signaling is often linked to
neurodegenerative disorders and schizophrenia.
5. Which brain region is primarily associated with executive function and decision making?
A. Amygdala
B. Prefrontal Cortex
C. Hippocampus
D. Basal Ganglia
Correct Answer: B
Explanation: The prefrontal cortex is the seat of executive functions, including planning,
decision-making, and impulse control. It integrates information from other brain regions to
regulate complex behavior and social interactions. Deficits in this area are commonly
observed in ADHD and schizophrenia.
6. Serotonin is synthesized from which precursor amino acid?
A. Tyrosine
Pharmacology Psychopharmacology for the
PMHNP | Actual Q&A with Rationale (NR546 Week
2 Exam) | Chamberlain University
1. Which enzyme is responsible for the rate-limiting step in the synthesis of dopamine?
A. DOPA decarboxylase
B. Tyrosine hydroxylase
C. Dopamine beta-hydroxylase
D. Monoamine oxidase
Correct Answer: B
Explanation: Tyrosine hydroxylase is the rate-limiting enzyme that converts tyrosine into
L-DOPA. This step determines the overall rate of catecholamine production within the
neuron. Inhibiting this enzyme would significantly decrease the levels of dopamine,
norepinephrine, and epinephrine.
2. What is the primary inhibitory neurotransmitter in the central nervous system?
A. Glutamate
B. Glycine
C. GABA
D. Acetylcholine
,Correct Answer: C
Explanation: Gamma-aminobutyric acid (GABA) is the most abundant inhibitory
neurotransmitter in the brain. It works by increasing chloride conductance into the neuron,
which hyperpolarizes the cell and reduces excitability. Medications such as
benzodiazepines enhance the effects of GABA to produce calming results.
3. A patient is taking a medication that acts as a partial agonist at the D2 receptor. What does
this imply?
A. It will always block all dopamine activity.
B. It will trigger a maximal biological response similar to dopamine.
C. It will act as an antagonist in high-dopamine environments and an agonist in low-
dopamine environments.
D. It binds to the receptor but has no intrinsic activity.
Correct Answer: C
Explanation: Partial agonists, like aripiprazole, have intrinsic activity that is lower than a
full agonist but greater than zero. In areas of the brain where dopamine is excessive, the
partial agonist acts as an antagonist by competing for receptors. Conversely, in areas where
dopamine is low, it provides a moderate level of stimulation to normalize signaling.
4. The NMDA receptor is a subtype of which neurotransmitter system?
A. Serotonin
B. Norepinephrine
, C. Acetylcholine
D. Glutamate
Correct Answer: D
Explanation: The N-methyl-D-aspartate (NMDA) receptor is a ligand-gated ionotropic
receptor for glutamate. It plays a critical role in synaptic plasticity and memory formation
due to its permeability to calcium. Dysfunction in NMDA signaling is often linked to
neurodegenerative disorders and schizophrenia.
5. Which brain region is primarily associated with executive function and decision making?
A. Amygdala
B. Prefrontal Cortex
C. Hippocampus
D. Basal Ganglia
Correct Answer: B
Explanation: The prefrontal cortex is the seat of executive functions, including planning,
decision-making, and impulse control. It integrates information from other brain regions to
regulate complex behavior and social interactions. Deficits in this area are commonly
observed in ADHD and schizophrenia.
6. Serotonin is synthesized from which precursor amino acid?
A. Tyrosine
