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What is the purpose of the Phosphate Buffered Saline (PBS) in the DNA extraction...

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What is the purpose of the Phosphate Buffered Saline (PBS) in the DNA extraction protocol?

It is used to breakdown the cell membrane to release the DNA.

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It is used to denature proteins that were released from the cell.

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It is used as the main buffer in the PCR reaction.

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The swab containing cheek cells is swirled around in this buffer to collect the cells.

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