1
Chemotherapy and Immunotherapy Comprehensive
Examination Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales | Pass
Guaranteed – A+ Graded
[SECTION 1: Chemotherapy Agents & Mechanisms of Action — Questions 1-20]
Q1: Which of the following chemotherapeutic agents functions by cross-linking DNA strands,
thereby interfering with DNA replication and transcription?
A. Vincristine
B. Methotrexate
C. Cyclophosphamide
D. Doxorubicin
C. [Correct answer] [CORRECT]
D. Doxorubicin
Correct Answer: C
Rationale: The best answer is C because cyclophosphamide is an alkylating agent, and the
primary mechanism of action for alkylating agents is the formation of covalent cross-links
between DNA strands. This cross-linking prevents DNA from uncoiling and separating,
effectively inhibiting replication and transcription, leading to cell death. Options A and D affect
microtubules and topoisomerase respectively, while Option B inhibits folate synthesis.
Q2: Which phase of the cell cycle is most susceptible to the action of Vinca alkaloids like
Vincristine?
A. G1 phase
B. S phase
C. M phase (Mitosis)
D. G0 phase
C. [Correct answer] [CORRECT]
,2
D. G0 phase
Correct Answer: C
Rationale: This choice is correct because Vinca alkaloids (vinblastine, vincristine, vinorelbine)
exert their cytotoxic effects during the M phase by binding to tubulin. This binding inhibits
microtubule assembly, preventing spindle formation and arresting cell division at metaphase,
making M-phase specific. Options A and B are incorrect because they occur prior to cell
division.
Q3: Methotrexate is classified as an antimetabolite that specifically acts as a folic acid
antagonist. Which enzyme does it inhibit?
A. Dihydrofolate reductase
B. Tyrosine kinase
C. Topoisomerase II
D. DNA polymerase
C. [Correct answer] [CORRECT]
D. DNA polymerase
Correct Answer: A
Rationale: Remember that methotrexate competitively inhibits dihydrofolate reductase (DHFR),
the enzyme responsible for converting folic acid to tetrahydrofolate. Without tetrahydrofolate,
cells cannot synthesize thymidine, purines, or serine, effectively halting DNA and RNA
synthesis. Options B and C are targets for other classes of oncology drugs.
Q4: A patient is receiving Doxorubicin. The nurse understands that this drug belongs to which
class of chemotherapeutic agents?
A. Alkylating agent
B. Antitumor antibiotic (Anthracycline)
C. Vinca alkaloid
D. Plant taxane
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C. [Correct answer] [CORRECT]
D. Plant taxane
Correct Answer: B
Rationale: The best answer is B because Doxorubicin is an anthracycline, a type of antitumor
antibiotic. Its mechanism involves intercalating into DNA and inhibiting topoisomerase II,
leading to free radical production that damages DNA. Options A, C, and D have distinctly
different mechanisms involving tubulin or DNA cross-linking.
Q5: Which of the following agents is a pyrimidine analog used in the treatment of pancreatic
cancer and non-small cell lung cancer?
A. Gemcitabine
B. Fludarabine
C. Cladribine
D. Etoposide
C. [Correct answer] [CORRECT]
D. Etoposide
Correct Answer: A
Rationale: This choice is correct because Gemcitabine is a nucleoside analog (antimetabolite)
structurally similar to deoxycytidine, which incorporates into DNA and stops replication. It is
commonly indicated for pancreatic, bladder, breast, and non-small cell lung cancers. Option B
and C are purine analogs, and Option D is a topoisomerase inhibitor.
Q6: The mechanism of action for Paclitaxel (Taxol) differs from Vincristine in that it:
A. Disassembles microtubules.
B. Promotes microtubule assembly and stabilizes them.
C. Cross-links DNA.
D. Inhibits topoisomerase I.
, 4
C. [Correct answer] [CORRECT]
D. Inhibits topoisomerase I.
Correct Answer: B
Rationale: The best answer is B because taxanes (paclitaxel, docetaxel) promote the assembly of
microtubules and stabilize them against depolymerization, essentially freezing the cytoskeleton.
This is the opposite of Vinca alkaloids, which prevent assembly. This stabilization prevents cells
from dividing, leading to apoptosis.
Q7: Which of the following agents is a topoisomerase I inhibitor indicated for ovarian cancer and
small cell lung cancer?
A. Etoposide
B. Irinotecan
C. Teniposide
D. Doxorubicin
C. [Correct answer] [CORRECT]
D. Doxorubicin
Correct Answer: A
Rationale: Remember that teniposide and topotecan are topoisomerase I inhibitors, while
etoposide and irinotecan target topoisomerase II. Option A is often used in lung and ovarian
cancers, whereas Options B and C target topoisomerase II. Option D is an anthracycline.
Q8: What is the lifetime cumulative dose limit for Doxorubicin to minimize the risk of
cardiotoxicity?
A. 250 mg/m²
B. 550 mg/m²
C. 900 mg/m²
D. 1200 mg/m²
Chemotherapy and Immunotherapy Comprehensive
Examination Actual Exam 2026/2027 – Complete
Exam-Style Questions with Detailed Rationales | Pass
Guaranteed – A+ Graded
[SECTION 1: Chemotherapy Agents & Mechanisms of Action — Questions 1-20]
Q1: Which of the following chemotherapeutic agents functions by cross-linking DNA strands,
thereby interfering with DNA replication and transcription?
A. Vincristine
B. Methotrexate
C. Cyclophosphamide
D. Doxorubicin
C. [Correct answer] [CORRECT]
D. Doxorubicin
Correct Answer: C
Rationale: The best answer is C because cyclophosphamide is an alkylating agent, and the
primary mechanism of action for alkylating agents is the formation of covalent cross-links
between DNA strands. This cross-linking prevents DNA from uncoiling and separating,
effectively inhibiting replication and transcription, leading to cell death. Options A and D affect
microtubules and topoisomerase respectively, while Option B inhibits folate synthesis.
Q2: Which phase of the cell cycle is most susceptible to the action of Vinca alkaloids like
Vincristine?
A. G1 phase
B. S phase
C. M phase (Mitosis)
D. G0 phase
C. [Correct answer] [CORRECT]
,2
D. G0 phase
Correct Answer: C
Rationale: This choice is correct because Vinca alkaloids (vinblastine, vincristine, vinorelbine)
exert their cytotoxic effects during the M phase by binding to tubulin. This binding inhibits
microtubule assembly, preventing spindle formation and arresting cell division at metaphase,
making M-phase specific. Options A and B are incorrect because they occur prior to cell
division.
Q3: Methotrexate is classified as an antimetabolite that specifically acts as a folic acid
antagonist. Which enzyme does it inhibit?
A. Dihydrofolate reductase
B. Tyrosine kinase
C. Topoisomerase II
D. DNA polymerase
C. [Correct answer] [CORRECT]
D. DNA polymerase
Correct Answer: A
Rationale: Remember that methotrexate competitively inhibits dihydrofolate reductase (DHFR),
the enzyme responsible for converting folic acid to tetrahydrofolate. Without tetrahydrofolate,
cells cannot synthesize thymidine, purines, or serine, effectively halting DNA and RNA
synthesis. Options B and C are targets for other classes of oncology drugs.
Q4: A patient is receiving Doxorubicin. The nurse understands that this drug belongs to which
class of chemotherapeutic agents?
A. Alkylating agent
B. Antitumor antibiotic (Anthracycline)
C. Vinca alkaloid
D. Plant taxane
,3
C. [Correct answer] [CORRECT]
D. Plant taxane
Correct Answer: B
Rationale: The best answer is B because Doxorubicin is an anthracycline, a type of antitumor
antibiotic. Its mechanism involves intercalating into DNA and inhibiting topoisomerase II,
leading to free radical production that damages DNA. Options A, C, and D have distinctly
different mechanisms involving tubulin or DNA cross-linking.
Q5: Which of the following agents is a pyrimidine analog used in the treatment of pancreatic
cancer and non-small cell lung cancer?
A. Gemcitabine
B. Fludarabine
C. Cladribine
D. Etoposide
C. [Correct answer] [CORRECT]
D. Etoposide
Correct Answer: A
Rationale: This choice is correct because Gemcitabine is a nucleoside analog (antimetabolite)
structurally similar to deoxycytidine, which incorporates into DNA and stops replication. It is
commonly indicated for pancreatic, bladder, breast, and non-small cell lung cancers. Option B
and C are purine analogs, and Option D is a topoisomerase inhibitor.
Q6: The mechanism of action for Paclitaxel (Taxol) differs from Vincristine in that it:
A. Disassembles microtubules.
B. Promotes microtubule assembly and stabilizes them.
C. Cross-links DNA.
D. Inhibits topoisomerase I.
, 4
C. [Correct answer] [CORRECT]
D. Inhibits topoisomerase I.
Correct Answer: B
Rationale: The best answer is B because taxanes (paclitaxel, docetaxel) promote the assembly of
microtubules and stabilize them against depolymerization, essentially freezing the cytoskeleton.
This is the opposite of Vinca alkaloids, which prevent assembly. This stabilization prevents cells
from dividing, leading to apoptosis.
Q7: Which of the following agents is a topoisomerase I inhibitor indicated for ovarian cancer and
small cell lung cancer?
A. Etoposide
B. Irinotecan
C. Teniposide
D. Doxorubicin
C. [Correct answer] [CORRECT]
D. Doxorubicin
Correct Answer: A
Rationale: Remember that teniposide and topotecan are topoisomerase I inhibitors, while
etoposide and irinotecan target topoisomerase II. Option A is often used in lung and ovarian
cancers, whereas Options B and C target topoisomerase II. Option D is an anthracycline.
Q8: What is the lifetime cumulative dose limit for Doxorubicin to minimize the risk of
cardiotoxicity?
A. 250 mg/m²
B. 550 mg/m²
C. 900 mg/m²
D. 1200 mg/m²
