1|Page
NR 565 NP Week 2 Exam 2026-2027 BANK QUESTIONS WITH
DETAILED VERIFIED ANSWERS EXAM QUESTIONS WILL
COME FROM HERE (100% CORRECT ANSWERS A+ GRADED
1. What is the primary organ responsible for drug metabolism in the
body?
A. Heart
B. Lungs
C. Liver
D. Kidneys
Answer: C. The liver is the primary organ for drug metabolism, utilizing
the cytochrome P450 enzyme system to biotransform drugs into more
water-soluble compounds for excretion.
2. Which phase of drug metabolism involves conjugation reactions?
A. Phase I
B. Phase II
C. Phase III
D. Phase IV
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Answer: B. Phase II metabolism involves conjugation reactions where
an endogenous substance is attached to the drug, increasing its water
solubility and promoting excretion.
3. A drug that binds to a receptor and activates it, producing the full
therapeutic response, is known as what?
A. Antagonist
B. Partial agonist
C. Full agonist
D. Inverse agonist
Answer: C. A full agonist binds to and activates a receptor, producing
the maximum pharmacologic response that drug is capable of
generating.
4. Which of the following best describes a drug with a narrow
therapeutic index?
A. The drug is safe for use in pregnancy.
B. Small changes in dose can lead to toxic or subtherapeutic effects.
C. The drug is metabolized by multiple pathways.
D. The drug has a high volume of distribution.
Answer: B. Narrow therapeutic index drugs have a small margin
between the effective dose and a toxic dose, requiring careful
monitoring of serum levels.
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5. The cytochrome P450 enzyme CYP3A4 is responsible for the
metabolism of what percentage of clinically used drugs?
A. Approximately 10%
B. Approximately 25%
C. Approximately 50%
D. Approximately 75%
Answer: C. CYP3A4 is the most abundant CYP enzyme in the liver and is
involved in the metabolism of roughly 50% of all drugs on the market.
6. What is the definition of bioavailability?
A. The rate at which a drug is eliminated from the body.
B. The fraction of an administered dose that reaches systemic
circulation unchanged.
C. The volume of plasma cleared of drug per unit time.
D. The time required for the plasma concentration to decrease by half.
Answer: B. Bioavailability represents the proportion of a drug that
enters systemic circulation and is available to exert its therapeutic
effect.
7. Which route of administration typically offers 100% bioavailability?
A. Oral
B. Intramuscular
C. Subcutaneous
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D. Intravenous
Answer: D. Intravenous administration bypasses absorption barriers,
directly entering the bloodstream, thus achieving complete
bioavailability.
8. The first-pass effect refers to metabolism of a drug occurring in
which location prior to reaching systemic circulation?
A. Kidneys and bladder
B. Brain and cerebrospinal fluid
C. Liver and gut wall
D. Lungs and heart
Answer: C. The first-pass effect occurs when orally administered drugs
are metabolized in the liver and intestinal wall before reaching systemic
circulation.
9. Which term describes the time it takes for the plasma concentration
of a drug to fall by half?
A. Duration of action
B. Clearance rate
C. Elimination half-life
D. Steady state
Answer: C. The elimination half-life is the time required for the plasma
drug concentration to decrease by 50%, dictating dosing intervals.
NR 565 NP Week 2 Exam 2026-2027 BANK QUESTIONS WITH
DETAILED VERIFIED ANSWERS EXAM QUESTIONS WILL
COME FROM HERE (100% CORRECT ANSWERS A+ GRADED
1. What is the primary organ responsible for drug metabolism in the
body?
A. Heart
B. Lungs
C. Liver
D. Kidneys
Answer: C. The liver is the primary organ for drug metabolism, utilizing
the cytochrome P450 enzyme system to biotransform drugs into more
water-soluble compounds for excretion.
2. Which phase of drug metabolism involves conjugation reactions?
A. Phase I
B. Phase II
C. Phase III
D. Phase IV
,2|Page
Answer: B. Phase II metabolism involves conjugation reactions where
an endogenous substance is attached to the drug, increasing its water
solubility and promoting excretion.
3. A drug that binds to a receptor and activates it, producing the full
therapeutic response, is known as what?
A. Antagonist
B. Partial agonist
C. Full agonist
D. Inverse agonist
Answer: C. A full agonist binds to and activates a receptor, producing
the maximum pharmacologic response that drug is capable of
generating.
4. Which of the following best describes a drug with a narrow
therapeutic index?
A. The drug is safe for use in pregnancy.
B. Small changes in dose can lead to toxic or subtherapeutic effects.
C. The drug is metabolized by multiple pathways.
D. The drug has a high volume of distribution.
Answer: B. Narrow therapeutic index drugs have a small margin
between the effective dose and a toxic dose, requiring careful
monitoring of serum levels.
,3|Page
5. The cytochrome P450 enzyme CYP3A4 is responsible for the
metabolism of what percentage of clinically used drugs?
A. Approximately 10%
B. Approximately 25%
C. Approximately 50%
D. Approximately 75%
Answer: C. CYP3A4 is the most abundant CYP enzyme in the liver and is
involved in the metabolism of roughly 50% of all drugs on the market.
6. What is the definition of bioavailability?
A. The rate at which a drug is eliminated from the body.
B. The fraction of an administered dose that reaches systemic
circulation unchanged.
C. The volume of plasma cleared of drug per unit time.
D. The time required for the plasma concentration to decrease by half.
Answer: B. Bioavailability represents the proportion of a drug that
enters systemic circulation and is available to exert its therapeutic
effect.
7. Which route of administration typically offers 100% bioavailability?
A. Oral
B. Intramuscular
C. Subcutaneous
, 4|Page
D. Intravenous
Answer: D. Intravenous administration bypasses absorption barriers,
directly entering the bloodstream, thus achieving complete
bioavailability.
8. The first-pass effect refers to metabolism of a drug occurring in
which location prior to reaching systemic circulation?
A. Kidneys and bladder
B. Brain and cerebrospinal fluid
C. Liver and gut wall
D. Lungs and heart
Answer: C. The first-pass effect occurs when orally administered drugs
are metabolized in the liver and intestinal wall before reaching systemic
circulation.
9. Which term describes the time it takes for the plasma concentration
of a drug to fall by half?
A. Duration of action
B. Clearance rate
C. Elimination half-life
D. Steady state
Answer: C. The elimination half-life is the time required for the plasma
drug concentration to decrease by 50%, dictating dosing intervals.
