Final answer:
Reactive oxygen species (ROS) like free radicals possess an unpaired electron, making them chemically reactive. They can easily oxidize other molecules, leading to cellular damage. Oxygen-free radicals, such as the hydroxyl radical (OH*), can cause harmful reactions that damage proteins and contribute to aging.
Step-by-step explanation:
Reactive oxygen species (ROS) such as peroxides and free radicals are highly reactive products of cellular processes. Free radicals are molecules or atoms that possess an unpaired electron, which makes them chemically reactive. They can easily oxidize other molecules in the cell, causing cellular damage and even cell death. Oxygen-free radicals, such as the hydroxyl radical (OH*), can lead to destructive reactions that damage proteins, react with DNA, and contribute to aging.