bioex_lect12 - MIT OpenCourseWare http:/ 5.111...

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MIT OpenCourseWare 5.111 Principles of Chemical Science Fall 2008 For information about citing these materials or our Terms of Use, visit: .
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Exceptions to Lewis Structure Rules: Free Radicals See lecture 10 (starting on page 3 of the notes) and lecture 11 for Lewis structures. See lecture 12 for exceptions to Lewis structure rules. Free radicals (or radicals) are molecules that have one or more unpaired electron. Due to the unpaired electron(s), most radicals are unstable and highly reactive. Example 1) from page 1 of Lecture 12 notes: Free radicals in biology Free radicals in biology: a paradox Free radical species damage DNA. Highly reactive oxygen radicals are a byproduct of metabolism and cause DNA damage (see information below*). Cigarette smoke contains free radicals that can damage DNA in lung cells and lead to cancer. Antioxidants (such as vitamin A, C, and E) reduce DNA damage in the body by “trapping” radicals.
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This note was uploaded on 03/02/2012 for the course CHEM 5111 taught by Professor Vogel during the Fall '08 term at MIT.

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bioex_lect12 - MIT OpenCourseWare http:/ 5.111...

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