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Why are bubbles avoided in restriction digest setup?

Answer and explanation

Correct answer: To maintain accurate mixing and pipetting

The direct answer is option A: bubbles are avoided to maintain accurate pipetting and proper mixing. Restriction-digest reactions often use very small volumes, so even a small bubble can occupy part of the measured volume or prevent liquid from being drawn and delivered accurately. Bubbles can also keep reagents from contacting one another uniformly, producing incomplete or uneven digestion. Gentle pipetting and careful mixing help keep the reaction homogeneous without damaging the sample. Option A is correct because accurate volume and mixing are essential for reproducible enzyme activity. Option B is wrong: bubbles do not convert DNA into protein. Option C is wrong because bubbles do not stain an enzyme. Option D is wrong because bubbles do not freeze a gel; gel temperature is controlled by other methods. The word “always” should be avoided in laboratory reasoning: bubbles may not ruin every reaction, but avoiding them is good technique. Memory cue: small reaction, small error matters—pipette gently and remove visible bubbles.

Related tags

BubblesPipetting AccuracyReaction Setup

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