... and radiation biologists believed that mutations in the nuclear DNA caused aging in humans. However, this was later deemed unlikely because of the numerous repair mechanisms and in turn the relative immutability for nuclear DNA (Life Extension, 1). Later on in the 1960's, a man named Denham Harman proposed his ... by free oxygen radicals, or molecules with Oxygen with a highly reactive unpaired electron. The formation of oxygen free radicals is a matter of basic chemistry, which takes place as a result of an error in the electron transport chain. Normally, in the electron transport chain,...

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• Approx Pages: 9
• Has Bibliography
• Grade Level: Undergraduate