Pharmacology 230 Final Exam 2026/2027 Ultimate Review and Study Guide: Complete Exam Preparation, In-Depth Practice Tests, and Final Assessment Manual

A researcher is explaining the "two-hit hypothesis" to a group of oncology students. Which statement best explains why tumor suppressor genes typically require two genetic "hits" before cancer develops? • A. Both inherited alleles of the tumor suppressor gene must be inactivated before normal growth regulation is lost. • B. One mutation initiates apoptosis, while the second mutation causes angiogenesis. • C. Tumor suppressor genes require two mutations because they are physically larger than proto-oncogenes. • D. Two mutations are required because the first mutation cannot alter DNA replication. Correct Answer: A. Both inherited alleles of the tumor suppressor gene must be inactivated before normal growth regulation is lost. Rationale: Tumor suppressor genes normally inhibit cell proliferation, repair DNA damage, or initiate apoptosis. Because individuals inherit two copies (alleles) of these genes, loss of function generally requires inactivation of both alleles—a concept known as Knudson's "two-hit hypothesis." The first mutation may be inherited or acquired, while the second usually occurs somatically. Question 2 A biopsy reveals a malignant tumor originating from bone tissue. Which diagnosis is most consistent with these findings? • A. Adenocarcinoma • B. Basal cell carcinoma • C. Multiple myeloma • D. Osteogenic sarcoma Correct Answer: D. Osteogenic sarcoma Rationale: Osteogenic sarcoma (osteosarcoma) is a malignant tumor arising from bone-forming connective tissue and is the most common primary malignant bone tumor. Adenocarcinomas arise from glandular epithelial tissue, basal cell carcinoma develops from epidermal basal cells, and multiple myeloma is a plasma cell malignancy of the bone marrow rather than connective tissue itself. Question 3 A patient receiving cytotoxic chemotherapy is instructed to avoid crowded public places and promptly report fever. Which chemotherapy-related skin complication most strongly supports this teaching? • A. Infection • B. Ultraviolet skin damage • C. Severe erythema • D. Chronic neuropathic pain Correct Answer: A. Infection Rationale: Chemotherapy suppresses rapidly dividing cells, including bone marrow progenitor cells, resulting in neutropenia and impaired immune defenses. The skin serves as an important protective barrier; when compromised alongside neutropenia, the risk of life-threatening bacterial, fungal, and viral infections increases significantly. Question 4 Which statement best describes the function of an oncogene? • A. It suppresses abnormal cell growth through apoptosis. • B. It encodes proteins that slow normal tissue proliferation. • C. It is a mutated gene that promotes uncontrolled cellular proliferation. • D. It repairs damaged DNA before mitosis. Correct Answer: C. It is a mutated gene that promotes uncontrolled cellular proliferation. Rationale: Oncogenes develop when proto-oncogenes undergo gain-of- function/activating mutations that cause excessive production of growth-promoting proteins. Tumor suppressor genes, not oncogenes, inhibit proliferation and promote apoptosis. Question 5 A patient loses the ability to regulate heart rate, blood pressure, swallowing, and coughing after suffering a brainstem injury. Which structure is most likely damaged? • A. Midbrain • B. Pons • C. Cerebellum • D. Medulla oblongata Correct Answer: D. Medulla oblongata Rationale: The medulla oblongata contains vital autonomic centers responsible for regulating cardiovascular and respiratory functions, as well as protective reflexes including coughing, sneezing, swallowing, and vomiting. Damage to this region can rapidly become life-threatening. Question 6 A patient sustains a cervical spinal cord injury involving the upper cervical segments. Why is this injury considered immediately life-threatening? • A. Severe hemorrhage causes hypovolemic shock. • B. Paralysis of the diaphragm may result in respiratory failure. • C. Brain edema inevitably develops. • D. Immediate spinal shock causes irreversible paralysis. Correct Answer: B. Paralysis of the diaphragm may result in respiratory failure. Rationale: The phrenic nerve, which innervates the diaphragm, arises primarily from spinal cord segments C3–C5 ("C3, C4, C5 keep the diaphragm alive"). High cervical spinal cord injuries interrupt these pathways, resulting in diaphragmatic paralysis and immediate respiratory arrest requiring mechanical ventilation. Question 7 Cancer cells frequently activate telomerase. What advantage does this provide? • A. It permanently suppresses mitosis. • B. It repairs telomeres, allowing unlimited cell division. • C. It initiates apoptosis when DNA damage occurs. • D. It inhibits angiogenesis. Correct Answer: B. It repairs telomeres, allowing unlimited cell division. Rationale: Telomerase restores telomere length after repeated cell divisions. Normal somatic cells lack significant telomerase activity, limiting their replicative lifespan. Malignant cells reactivate telomerase to maintain chromosome ends and achieve replicative immortality. Question 8 Persistent infection with which virus is most strongly associated with cervical cancer? • A. Human immunodeficiency virus • B. Herpes simplex virus • C. Human papillomavirus • D. Epstein-Barr virus Correct Answer: C. Human papillomavirus Rationale: Persistent infection with high-risk Human Papillomavirus (HPV), particularly types 16 and 18, is the primary cause of cervical cancer. Viral proteins E6 and E7 inactivate tumor suppressor proteins p53 and Rb, respectively, driving oncogenesis. Question 9 A patient with a spinal cord injury above T6 develops severe hypertension, profuse sweating above the lesion, piloerection, and headache after bladder distention. Which complication is most likely? • A. Parasympathetic dysreflexia • B. Craniosacral dysreflexia • C. Autonomic hyperreflexia • D. Retrograde hyperreflexia Correct Answer: C. Autonomic hyperreflexia Rationale: Autonomic hyperreflexia (autonomic dysreflexia) occurs after spinal cord injuries at or above T6. Noxious visceral or cutaneous stimuli below the lesion trigger an uninhibited, exaggerated sympathetic response, leading to severe hypertension, throbbing headache, and compensatory parasympathetic flushing/sweating above the lesion. Question 10 Tumor suppressor genes are also commonly known as: • A. Proto-oncogenes • B. Oncogenes • C. Anti-oncogenes • D. RAS mutations Correct Answer: C. Anti-oncogenes Rationale: Tumor suppressor genes are termed anti-oncogenes because their physiological function is to brake cell proliferation, repair DNA, or trigger programmed cell death, thereby opposing oncogenic transformation. Question 11 A 28-year-old woman develops intermittent episodes of blurred vision, numbness, and weakness that improve before recurring months later. Magnetic resonance imaging (MRI) demonstrates multiple plaques within the central nervous system (CNS). Which diagnosis best explains these findings? • A. Inadequate acetylcholine at the neuromuscular junction caused by an autoimmune disorder • B. A CNS demyelinating disease, likely resulting from autoimmune and immunogenetic mechanisms • C. Degeneration of upper and lower motor neurons caused by viral infection • D. Dopamine depletion within the basal ganglia due to viral destruction Correct Answer: B. A CNS demyelinating disease, likely resulting from autoimmune and immunogenetic mechanisms Rationale: Multiple Sclerosis (MS) is an autoimmune demyelinating disease of the CNS characterized by neurologic deficits "separated in time and space." T-cell mediated destruction of oligodendrocytes leads to demyelinating plaques visible on MRI.