Lecture28_patterns

Lecture28_patterns - Announcement Pattern formation during...

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1 Pattern formation during Development Bis2A Lecture 28 Announcement No large overflow exam room available for our final EVERYONE will be in here. – Move to the centers of the rows – Nearly every seat will be filled – Be sure to keep your eyes on your own exam! Dramatic New Discovery! Yesterday (12/2/10) NASA announced the discovery of an organism with novel biochemistry In the lab, can use arsenic in place of phosphorous In DNA, RNA, NADH, ATP, etc Presumably does the same in the wild Thought to be an adaptation allowing the organism to live in a high arsenic environment Bacterium found in Mono Lake, CA Scientists expected to find such an organism (eventually) • Why? Scientists expected to find such an organism (eventually) • Why? – Phosphorous and arsenic have similar chemical properties (same number of unoccupied orbitals) – Thus, they can perform the same fundamental functions within a cell
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