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What is the purpose of the dna ladder in gel electrophoresis.

User Dela
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A: Ladders provide reference points for accurate sizing of DNA fragments within gels – when run alongside samples, they give visible measureable landmarks that allow you to calculate exact size of molecules present based upon distance traveled from origin point (well) and respective band position on ladder – making it easy to compare sizes between different samples or unknown samples against known standards.

User Krista K
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