BIOD 351 / BIOD351 Module 1: Pharmacology Exam
Actual 2025/2026 with Detailed Rationales | 100%
Verified | Pass Guaranteed – A+ Graded
Section 1: Pharmacokinetics (12 Questions)
Q1: Which phase of pharmacokinetics describes the movement of a drug from the
site of administration into the bloodstream?
A. Distribution
B. Metabolism
C. Absorption [CORRECT]
D. Excretion
Correct Answer: C
Rationale: Correct because absorption is the process by which a drug moves from its
site of administration across biological membranes into the systemic circulation.
Q2: A drug with a high first-pass effect is administered orally. Which consequence is
most likely?
A. Increased bioavailability
B. Reduced systemic bioavailability due to hepatic metabolism [CORRECT]
C. Enhanced renal excretion
D. Increased volume of distribution
Correct Answer: B
Rationale: Correct because the first-pass effect occurs when a drug is extensively
metabolized by the liver after absorption from the gastrointestinal tract before
reaching systemic circulation, significantly reducing bioavailability.
Q3: The volume of distribution (Vd) of a drug is 50 liters. What does this suggest
about the drug's distribution in the body?
A. The drug is primarily confined to the plasma
B. The drug is extensively distributed into tissues [CORRECT]
C. The drug is completely excluded from adipose tissue
D. The drug has minimal protein binding
Correct Answer: B
, Rationale: Correct because a Vd greater than total body water (~42 L) indicates
extensive tissue distribution, suggesting the drug is lipophilic or highly bound to
tissue components.
Q4: Which organ is the primary site of drug metabolism in the body?
A. Kidneys
B. Liver [CORRECT]
C. Lungs
D. Intestines
Correct Answer: B
Rationale: Correct because the liver contains the highest concentration of
drug-metabolizing enzymes, particularly the cytochrome P450 system, and is
responsible for the majority of biotransformation reactions.
Q5: A drug has a half-life of 6 hours. Approximately how long will it take for the drug
to reach steady-state concentration with repeated dosing?
A. 6 hours
B. 12 hours
C. 24–30 hours [CORRECT]
D. 48 hours
Correct Answer: C
Rationale: Correct because steady-state concentration is typically reached after 4–5
half-lives; with a 6-hour half-life, this equates to 24–30 hours of continuous or
repeated administration.
Q6: Which route of administration provides 100% bioavailability by definition?
A. Oral
B. Intravenous [CORRECT]
C. Subcutaneous
D. Intramuscular
Correct Answer: B
Rationale: Correct because intravenous administration delivers the drug directly into
the systemic circulation, bypassing absorption barriers and first-pass metabolism,
resulting in complete bioavailability.
Q7: A patient with renal failure is prescribed a drug that is primarily eliminated
unchanged by the kidneys. What adjustment is most likely necessary?
A. Increase the dose and frequency
Actual 2025/2026 with Detailed Rationales | 100%
Verified | Pass Guaranteed – A+ Graded
Section 1: Pharmacokinetics (12 Questions)
Q1: Which phase of pharmacokinetics describes the movement of a drug from the
site of administration into the bloodstream?
A. Distribution
B. Metabolism
C. Absorption [CORRECT]
D. Excretion
Correct Answer: C
Rationale: Correct because absorption is the process by which a drug moves from its
site of administration across biological membranes into the systemic circulation.
Q2: A drug with a high first-pass effect is administered orally. Which consequence is
most likely?
A. Increased bioavailability
B. Reduced systemic bioavailability due to hepatic metabolism [CORRECT]
C. Enhanced renal excretion
D. Increased volume of distribution
Correct Answer: B
Rationale: Correct because the first-pass effect occurs when a drug is extensively
metabolized by the liver after absorption from the gastrointestinal tract before
reaching systemic circulation, significantly reducing bioavailability.
Q3: The volume of distribution (Vd) of a drug is 50 liters. What does this suggest
about the drug's distribution in the body?
A. The drug is primarily confined to the plasma
B. The drug is extensively distributed into tissues [CORRECT]
C. The drug is completely excluded from adipose tissue
D. The drug has minimal protein binding
Correct Answer: B
, Rationale: Correct because a Vd greater than total body water (~42 L) indicates
extensive tissue distribution, suggesting the drug is lipophilic or highly bound to
tissue components.
Q4: Which organ is the primary site of drug metabolism in the body?
A. Kidneys
B. Liver [CORRECT]
C. Lungs
D. Intestines
Correct Answer: B
Rationale: Correct because the liver contains the highest concentration of
drug-metabolizing enzymes, particularly the cytochrome P450 system, and is
responsible for the majority of biotransformation reactions.
Q5: A drug has a half-life of 6 hours. Approximately how long will it take for the drug
to reach steady-state concentration with repeated dosing?
A. 6 hours
B. 12 hours
C. 24–30 hours [CORRECT]
D. 48 hours
Correct Answer: C
Rationale: Correct because steady-state concentration is typically reached after 4–5
half-lives; with a 6-hour half-life, this equates to 24–30 hours of continuous or
repeated administration.
Q6: Which route of administration provides 100% bioavailability by definition?
A. Oral
B. Intravenous [CORRECT]
C. Subcutaneous
D. Intramuscular
Correct Answer: B
Rationale: Correct because intravenous administration delivers the drug directly into
the systemic circulation, bypassing absorption barriers and first-pass metabolism,
resulting in complete bioavailability.
Q7: A patient with renal failure is prescribed a drug that is primarily eliminated
unchanged by the kidneys. What adjustment is most likely necessary?
A. Increase the dose and frequency
