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Very small extra bands in a restriction fragment pattern can be linked with what?

Answer and explanation

Correct answer: Extra cut sites or star activity

The governing concept is that an unexpected small band may reflect an additional DNA cleavage product rather than a ligation or expression event. It can arise from an extra restriction site present in the DNA sequence, or from star activity, in which a restriction enzyme cuts sequences similar to but not identical with its normal recognition site under unsuitable conditions. Excess enzyme, incorrect buffer, high glycerol concentration, prolonged incubation, or unsuitable pH can increase this nonspecific cleavage. Option D is correct. DNA ligase, cell culture, and protein synthesis do not directly create extra restriction fragments in the digestion lane. Appropriate controls, a corrected buffer, shorter incubation, and sequencing or mapping can help determine whether the band is genuine or an artefact.

Related tags

Star ActivityExtra Restriction SitesRestriction PatternRestriction EnzymesPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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