Figure 3 outlines a method that can be used to extract DNA from fruit - Edexcel - GCSE Biology Combined Science - Question 2 - 2016 - Paper 1
Question 2
Figure 3 outlines a method that can be used to extract DNA from fruit.
Crush fruit with a buffer solution containing detergent
Filter the mixture
Add ethanol and ... show full transcript
Worked Solution & Example Answer:Figure 3 outlines a method that can be used to extract DNA from fruit - Edexcel - GCSE Biology Combined Science - Question 2 - 2016 - Paper 1
Step 1
Give a reason for filtering the mixture.
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Answer
Filtering the mixture is necessary to remove large and insoluble plant debris after crushing the fruit. This step allows for a cleaner solution containing the dissolved DNA and prevents any undissolved particles from interfering in subsequent steps.
Step 2
What is the role of the ethanol?
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Answer
The role of the ethanol is to precipitate the DNA. By adding ethanol, the DNA becomes less soluble in the mixture, causing it to aggregate and form visible strands that can be extracted.
