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Tuesday, October 03, 2006

In the DNA


DNA (Deoxyribonucleic acid)
As part of the Unit 1 Higher Biology syllabus, one of the optional practicals is basic DNA extraction. This is a great practical which usually has excellent results. When DNA extractions are performed, you can expect three basic results:

1. No DNA
2. DNA appears fluffy which means it has sheared in the extraction process
3. DNA appears as thin threads.

Although DNA that strands is the most impressive, DNA that has sheared still shows that DNA is present. Having experimented with many types of fruit over the years, I have come to the conclusion that strawberries or ripe kiwi fruit will provide the best results.

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