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Why is a DNA ladder useful in gel electrophoresis?

Answer and explanation

Correct answer: To compare the sizes of sample DNA fragments with DNA fragments of known sizes

A DNA ladder is a mixture of DNA fragments with known base-pair lengths. Comparing the positions of its bands with sample bands on the gel helps estimate the sizes of sample DNA fragments. Cell lysis is an earlier step in DNA isolation; a ladder is only a molecular size marker. Exam tip: remember that a DNA ladder is used as a molecular size marker in gel electrophoresis.

Related tags

Dna LadderGel ElectrophoresisDna Fragment SizeMolecular Size MarkerRecombinant Dna TechnologyIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnology

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