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Why is the ladder lane necessary on a restriction digest gel?

Answer and explanation

Correct answer: To compare sample fragment sizes with known standards

The governing concept is electrophoretic size estimation. A DNA ladder contains fragments of previously known lengths and is loaded in a separate lane beside the digested sample. Because DNA fragments move through agarose gel according to size, the position of an unknown band can be compared with nearby ladder bands. This gives an approximate fragment length and helps determine whether the restriction digest produced the expected pattern. The ladder does not perform digestion, methylation, or heating; those actions are unrelated to its role. Therefore, comparing fragment sizes with known standards is the correct reason for using the ladder lane.

Related tags

Dna LadderGel ElectrophoresisRestriction DigestCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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