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What is proteinase K known for in DNA extraction?

Answer and explanation

Correct answer: Degrading proteins

The direct answer is C: proteinase K is used to degrade proteins. It is a proteolytic enzyme that digests many proteins during DNA extraction, including proteins associated with cells and enzymes that might damage DNA, such as nucleases. The reasoning is: cells are broken open; proteins and nucleases are released; proteinase K breaks those proteins into smaller pieces; removal of protein improves DNA purity and helps protect DNA from enzymatic degradation. Option C is correct because this is the established role of proteinase K in many extraction protocols. Option A is wrong because methylating DNA requires DNA methyltransferase, not proteinase K. Option B is wrong because copying RNA into DNA or another nucleic acid requires polymerase-based processes, not a protease. Option D is wrong because cellulose production is a biological synthesis process and is unrelated to proteinase K. Proteinase K does not selectively remove every contaminant, so other steps such as extraction, washing, and purification may still be needed. Memory cue: “proteinase K attacks protein,” including unwanted nucleases.

Related tags

Proteinase KProtein DegradationDna Purity

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