In the indirect effect, radiolysis of which abundant cellular component leads to free radical formation?

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Multiple Choice

In the indirect effect, radiolysis of which abundant cellular component leads to free radical formation?

Water radiolysis drives the indirect effect because water is by far the most abundant molecule in cells. When ionizing radiation hits water, it splits it into reactive species like hydroxyl radicals, hydrogen atoms, and solvated electrons. These free radicals diffuse and readily react with nearby biomolecules, especially DNA, causing strand breaks and base damage. Since most cellular damage from radiation comes from these radical reactions rather than direct hits on DNA, radiolysis of water is the key source of free radical formation.

Water radiolysis drives the indirect effect because water is by far the most abundant molecule in cells. When ionizing radiation hits water, it splits it into reactive species like hydroxyl radicals, hydrogen atoms, and solvated electrons. These free radicals diffuse and readily react with nearby biomolecules, especially DNA, causing strand breaks and base damage. Since most cellular damage from radiation comes from these radical reactions rather than direct hits on DNA, radiolysis of water is the key source of free radical formation.

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