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Why should gel buffer and gel casting buffer be the same type in restriction digest analysis?

Answer and explanation

Correct answer: For consistent ionic condition

The governing concept is that electrophoresis depends on a stable electrical and chemical environment. The buffer used to cast the agarose gel and the buffer placed in the electrophoresis tank should normally be the same compatible type and concentration. This maintains consistent ions, pH, and conductivity throughout the gel system, allowing DNA fragments to migrate predictably and bands to resolve properly. A mismatch can alter current flow, heating, migration rate, or band sharpness, making interpretation less reliable. The buffer is not used to color the enzyme, methylate DNA, or make the gel edible. Thus option A correctly identifies the need for consistent ionic conditions.

Related tags

Gel BufferCasting BufferIonic ConditionCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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