Most cell damage occurs as a result of which effect?

Most cell damage occurs as a result of which effect?

• A. Indirect effect
• B. Direct effect
• C. Mutations
• D. Law of Bergonié and Tribondeau

Answer: (A)

Ionizing radiation mostly damages cells through the indirect effect: it interacts with the abundant water in cells, splitting it into reactive free radicals (like hydroxyl radicals). These radicals diffuse short distances and attack DNA and other critical biomolecules, causing strand breaks and cellular dysfunction that lead to damage or death. Direct interactions with DNA do occur, but they are less common because most energy deposition happens in water rather than directly in the DNA. Mutations can result from the damage, but they’re a consequence rather than the primary mechanism. The law of Bergonié and Tribondeau explains factors that influence radiosensitivity, not how the damage occurs. So the indirect effect best explains why most cell damage happens.

Ionizing radiation mostly damages cells through the indirect effect: it interacts with the abundant water in cells, splitting it into reactive free radicals (like hydroxyl radicals). These radicals diffuse short distances and attack DNA and other critical biomolecules, causing strand breaks and cellular dysfunction that lead to damage or death. Direct interactions with DNA do occur, but they are less common because most energy deposition happens in water rather than directly in the DNA. Mutations can result from the damage, but they’re a consequence rather than the primary mechanism. The law of Bergonié and Tribondeau explains factors that influence radiosensitivity, not how the damage occurs. So the indirect effect best explains why most cell damage happens.