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Why does increasing incubation time not always help in restriction digestion?

Answer and explanation

Correct answer: Very long incubation can cause non-specific DNA cleavage (star activity)

A is correct. Restriction digestion is usually completed within the recommended incubation time. Excessively long incubation, especially under non-optimal conditions, may allow the enzyme to cut DNA at sequences similar to its normal recognition site. This non-specific cleavage is called star activity and can produce unwanted DNA fragments. Extra time does not increase enzyme concentration, convert sticky ends into blunt ends, or purify DNA. Exam tip: For digestion, follow the prescribed enzyme, buffer, temperature, and incubation time together.

Related tags

Restriction DigestionIncubation TimeStar ActivityRestriction EnzymesDna CleavageCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnology

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