... determine if you should shut down public access to the lake, or if the lake is safe.Large DNA moleculesare compacted in a cellby supercoiling.relaxed supercoiledProteins often bind to specific ... acid (DNA), the basic molecule of life. Examination of DNA from individuals, other than identical twins, has shown that variations exist and that a specific DNA pattern or profile could be ... membrane to a piece of x-ray film which allows the scientist to determine which specific fragments the probe identified among the thousands in a sample of human DNA. A "match" is made...