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Why is high yield but degraded DNA a problem after DNA isolation?

Answer and explanation

Correct answer: DNA may be unusable for some downstream uses

The direct answer is option C: DNA may be unusable for some downstream uses. DNA quality has more than one part: yield means how much DNA is present, purity means how free it is from contaminants, and integrity means whether the long DNA molecules are intact. A sample can have a large measured amount but still be broken into many small fragments. Step by step, degradation breaks the DNA backbone; fragments may then be too short for restriction mapping, long-range PCR, library preparation, cloning or other applications needing intact molecules. Option A is wrong because degraded DNA is not always best; many experiments need long, complete DNA. Option B is wrong because yield alone cannot describe quality. Option C is correct because fragmentation can make the sample unsuitable even when its concentration is high. Option D is wrong because DNA degradation does not mean that protein will disappear; protein contamination and DNA integrity are separate issues. Exam cue: remember “quantity is how much, integrity is how whole.” Good DNA needs both sufficient amount and suitable intactness.

Related tags

High YieldDegraded DnaIntegrity

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