NR565 Advanced Pharmacology Midterm
Exam: Complete 200-Question Study Guide
with Answers & Rationales for 2026/2027
SECTION 1: PHARMACOKINETICS &
PHARMACODYNAMICS
Question 1
A patient is prescribed a drug that is a
weak base with a pKa of 8.4. In which part
of the body will this drug be most highly
ionized?
A) Small intestine (pH 7.4)
B) Stomach (pH 1.5–3.5)
C) Blood (pH 7.35–7.45)
D) Urine (pH 5.0–8.0)
,✔ Correct Answer: B
Rationale: Weak bases are more ionized in
acidic environments (low pH). Ionized drugs
are poorly absorbed across lipid
membranes. Weak acids are better
absorbed in the stomach; weak bases are
better absorbed in the small intestine .
Question 2
Which pharmacokinetic process is most
affected by first-pass metabolism?
A) Distribution
B) Metabolism
C) Oral absorption
D) Renal excretion
✔ Correct Answer: C
,Rationale: First-pass metabolism occurs in
the liver and gut wall after oral
administration, reducing the amount of
active drug reaching systemic circulation.
Drugs with extensive first-pass effect often
require higher oral doses or alternative
routes (IV, sublingual, transdermal) .
Question 3
The time required for half of a drug
concentration to be eliminated from the
body is called:
A) Peak level
B) Bioavailability
C) Half-life
D) Potency
, ✔ Correct Answer: C
Rationale: Half-life determines dosing
intervals and duration of action. It is the
time required for the drug concentration in
the body to be reduced by 50% .
Question 4
What does bioavailability refer to?
A) The amount of drug that reaches
systemic circulation unchanged
B) The rate at which drug is metabolized
C) The time it takes for drug to be
eliminated
D) The volume of distribution
✔ Correct Answer: A
Exam: Complete 200-Question Study Guide
with Answers & Rationales for 2026/2027
SECTION 1: PHARMACOKINETICS &
PHARMACODYNAMICS
Question 1
A patient is prescribed a drug that is a
weak base with a pKa of 8.4. In which part
of the body will this drug be most highly
ionized?
A) Small intestine (pH 7.4)
B) Stomach (pH 1.5–3.5)
C) Blood (pH 7.35–7.45)
D) Urine (pH 5.0–8.0)
,✔ Correct Answer: B
Rationale: Weak bases are more ionized in
acidic environments (low pH). Ionized drugs
are poorly absorbed across lipid
membranes. Weak acids are better
absorbed in the stomach; weak bases are
better absorbed in the small intestine .
Question 2
Which pharmacokinetic process is most
affected by first-pass metabolism?
A) Distribution
B) Metabolism
C) Oral absorption
D) Renal excretion
✔ Correct Answer: C
,Rationale: First-pass metabolism occurs in
the liver and gut wall after oral
administration, reducing the amount of
active drug reaching systemic circulation.
Drugs with extensive first-pass effect often
require higher oral doses or alternative
routes (IV, sublingual, transdermal) .
Question 3
The time required for half of a drug
concentration to be eliminated from the
body is called:
A) Peak level
B) Bioavailability
C) Half-life
D) Potency
, ✔ Correct Answer: C
Rationale: Half-life determines dosing
intervals and duration of action. It is the
time required for the drug concentration in
the body to be reduced by 50% .
Question 4
What does bioavailability refer to?
A) The amount of drug that reaches
systemic circulation unchanged
B) The rate at which drug is metabolized
C) The time it takes for drug to be
eliminated
D) The volume of distribution
✔ Correct Answer: A
