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What is the main purpose of preserving a sample during DNA extraction?

Answer and explanation

Correct answer: To reduce DNA degradation

The governing concept is preservation of nucleic-acid integrity before and during extraction. A biological sample can contain nucleases, microorganisms, and other factors that progressively break DNA into smaller fragments. Keeping the sample cold, using suitable storage conditions, and applying approved protective reagents can slow nuclease activity and microbial growth. Consequently, more of the original DNA remains intact and available for purification, amplification, or analysis. Option B is correct because preservation aims to reduce degradation. Staining is a later visualization step, burning destroys DNA, and conversion of protein into starch is unrelated to nucleic-acid isolation.

Related tags

Sample PreservationDna DegradationNuclease ActivityIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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