Carcinogens induce DNA mutations leading to uncontrolled cell division in lung tissue

Steps:

• Identify that carcinogens are agents causing cancer by damaging DNA.
• Recall tumors form from uncontrolled mitosis in affected cells.
• Evaluate options for accurate description of DNA change and cell division in bronchial epithelium.
• Select the option linking DNA alteration directly to uncontrolled mitosis.

Why C is correct:

• Carcinogens mutate DNA, disrupting cell cycle control and causing bronchial epithelial cells to undergo uncontrolled mitosis, per the definition of oncogenesis.

Why the others are wrong:

• A: Rapid division in alveoli repairs damage but does not cause tumors via carcinogens.
• B: Cilia paralysis leads to mucus buildup and infection risk, not direct DNA changes for tumors.
• D: Reduced oxygen transport affects respiration but does not trigger uncontrolled mitosis in bronchial cells.

Final answer: C