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What is the practical purpose of spin-down in restriction digest?

Answer and explanation

Correct answer: Bringing drops to tube bottom

The direct answer is A: bringing drops to the tube bottom. During pipetting, small droplets may remain on the tube wall or under the cap. A brief spin-down uses centrifugal force to move those droplets to the bottom, where they mix with the other reaction components. This helps ensure that the intended complete volume participates in digestion. Option A is correct. Option B is wrong because the enzyme performs DNA cutting; spinning does not cut DNA. Option C is wrong because spin-down cannot make an enzyme. Option D is wrong because gel staining happens after electrophoresis and is not caused by centrifugation. Spin-down may also collect liquid and reduce loss, but it does not replace mixing or correct a bad reaction.

Related tags

Spin DownDropletsReaction Setup

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