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What can a very bright smear after restriction digestion indicate?

Answer and explanation

Correct answer: DNA overloading or substantial DNA degradation

The governing concept is interpretation of DNA bands and smears after gel electrophoresis. A very bright, diffuse smear may occur when too much DNA has been loaded, causing overlapping material that cannot resolve into clear bands. It can also indicate that the DNA was degraded into many fragments, which migrate over a broad size range. The gel image alone may not distinguish these causes, so loading amount and DNA quality should be checked, ideally with an appropriate control. Option C is correct. A bright smear does not prove a perfect sequence, does not mean DNA is absent, and does not establish that the enzyme was always missing.

Related tags

Bright SmearOverloaded DnaDna DegradationCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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