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A student extracts DNA from a strawberry using the following steps: 1. Mash the strawberry with a fork. 2. Add a solution of salt and washing-up liquid to the mashed strawberry. 3. Stir gently for a few minutes. 4. Filter the mixture using a coffee filter into a test tube. 5. Carefully pour ice-cold propan-2-ol down the side of the test tube. Explain why stirring gently in step 3 is important, and what the student would observe after step 5. Unofficial practice material [3 marks].
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