1
NU 518 MODULE 1 EXAM 2026/2027 |
ADVANCED PHARMACOLOGY | 40 VERIFIED
Q&A | DETAILED RATIONALES | NGN-
ALIGNED | PASS GUARANTEED – A+ GRADED
SECTION 1: PHARMACOKINETICS - Questions 1-10
Q1: pH Partitioning
The student is reviewing drug absorption. A weak acid drug is administered orally. In which
environment is it most likely to be absorbed?
A. Acidic environment of the stomach
B. Alkaline environment of the small intestine
C. Neutral environment of the mouth
D. Alkaline environment of the large intestine
Correct Answer: A
Rationale: Weak acids are nonionized in acidic environments, which increases their lipid solubility
and allows them to cross cell membranes more readily. Therefore, a weak acid is better absorbed in
the acidic environment of the stomach. Weak bases are better absorbed in the alkaline environment
of the small intestine. [100% CORRECT]
Q2: Active Transport
The student is reviewing drug transport mechanisms. Which characteristic describes active
transport?
A. Requires energy and can move drugs against a concentration gradient
B. Does not require energy and moves drugs down a concentration gradient
C. Requires a carrier but no energy
D. Moves drugs through aqueous channels
Correct Answer: A
Rationale: Active transport requires energy (ATP) and can move drugs against a concentration
gradient. It is carrier-mediated and saturable. Passive diffusion does not require energy and moves
drugs down a concentration gradient. Facilitated diffusion requires a carrier but no energy. [100%
CORRECT]
Q3: Volume of Distribution Calculation
, 2
The student is reviewing pharmacokinetic calculations. A drug has a dose of 500 mg and a plasma
concentration of 25 mg/L. What is the apparent volume of distribution?
A. 5 L
B. 10 L
C. 20 L
D. 25 L
Correct Answer: C
Rationale: Volume of distribution (Vd) = Dose / Plasma concentration = 500 mg / 25 mg/L = 20 L. Vd
is a theoretical volume that relates the amount of drug in the body to its plasma concentration.
[100% CORRECT]
Q4: Bioavailability Factors
The student is reviewing bioavailability. Which factor decreases the oral bioavailability of a drug?
A. High first-pass metabolism
B. High lipid solubility
C. Small molecular size
D. Rapid dissolution
Correct Answer: A
Rationale: High first-pass metabolism reduces the amount of drug reaching systemic circulation
unchanged, decreasing oral bioavailability. High lipid solubility, small molecular size, and rapid
dissolution increase absorption and bioavailability. [100% CORRECT]
Q5: Half-Life Calculation
The student is reviewing half-life. A drug has a half-life of 4 hours. After 16 hours, what percentage
of the original dose remains?
A. 25%
B. 12.5%
C. 6.25%
D. 3.125%
Correct Answer: C
Rationale: After 4 half-lives (16 hours / 4 hours = 4), the remaining percentage is (1/2)^4 = 1/16 =
6.25%. [100% CORRECT]
Q6: Steady-State Concentration
The student is reviewing steady-state. Approximately how many half-lives are required to reach
steady-state plasma concentration with a constant-rate infusion?
NU 518 MODULE 1 EXAM 2026/2027 |
ADVANCED PHARMACOLOGY | 40 VERIFIED
Q&A | DETAILED RATIONALES | NGN-
ALIGNED | PASS GUARANTEED – A+ GRADED
SECTION 1: PHARMACOKINETICS - Questions 1-10
Q1: pH Partitioning
The student is reviewing drug absorption. A weak acid drug is administered orally. In which
environment is it most likely to be absorbed?
A. Acidic environment of the stomach
B. Alkaline environment of the small intestine
C. Neutral environment of the mouth
D. Alkaline environment of the large intestine
Correct Answer: A
Rationale: Weak acids are nonionized in acidic environments, which increases their lipid solubility
and allows them to cross cell membranes more readily. Therefore, a weak acid is better absorbed in
the acidic environment of the stomach. Weak bases are better absorbed in the alkaline environment
of the small intestine. [100% CORRECT]
Q2: Active Transport
The student is reviewing drug transport mechanisms. Which characteristic describes active
transport?
A. Requires energy and can move drugs against a concentration gradient
B. Does not require energy and moves drugs down a concentration gradient
C. Requires a carrier but no energy
D. Moves drugs through aqueous channels
Correct Answer: A
Rationale: Active transport requires energy (ATP) and can move drugs against a concentration
gradient. It is carrier-mediated and saturable. Passive diffusion does not require energy and moves
drugs down a concentration gradient. Facilitated diffusion requires a carrier but no energy. [100%
CORRECT]
Q3: Volume of Distribution Calculation
, 2
The student is reviewing pharmacokinetic calculations. A drug has a dose of 500 mg and a plasma
concentration of 25 mg/L. What is the apparent volume of distribution?
A. 5 L
B. 10 L
C. 20 L
D. 25 L
Correct Answer: C
Rationale: Volume of distribution (Vd) = Dose / Plasma concentration = 500 mg / 25 mg/L = 20 L. Vd
is a theoretical volume that relates the amount of drug in the body to its plasma concentration.
[100% CORRECT]
Q4: Bioavailability Factors
The student is reviewing bioavailability. Which factor decreases the oral bioavailability of a drug?
A. High first-pass metabolism
B. High lipid solubility
C. Small molecular size
D. Rapid dissolution
Correct Answer: A
Rationale: High first-pass metabolism reduces the amount of drug reaching systemic circulation
unchanged, decreasing oral bioavailability. High lipid solubility, small molecular size, and rapid
dissolution increase absorption and bioavailability. [100% CORRECT]
Q5: Half-Life Calculation
The student is reviewing half-life. A drug has a half-life of 4 hours. After 16 hours, what percentage
of the original dose remains?
A. 25%
B. 12.5%
C. 6.25%
D. 3.125%
Correct Answer: C
Rationale: After 4 half-lives (16 hours / 4 hours = 4), the remaining percentage is (1/2)^4 = 1/16 =
6.25%. [100% CORRECT]
Q6: Steady-State Concentration
The student is reviewing steady-state. Approximately how many half-lives are required to reach
steady-state plasma concentration with a constant-rate infusion?
