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What problem can occur if template DNA is very viscous in restriction digestion reaction?

Answer and explanation

Correct answer: Pipetting can be inaccurate and mixing poor

The direct answer is A: pipetting can become inaccurate and mixing can be poor. Very viscous DNA resists flowing through a pipette tip, so the delivered volume may not be reliable. It may also remain as a concentrated string or lump instead of mixing evenly with buffer and restriction enzyme. Poorly mixed DNA can expose some molecules to the enzyme while leaving others less accessible, producing incomplete or variable digestion. Option A is correct because viscosity affects both measurement and uniform reaction contact. Option B is wrong because enzyme does not become protein as a result of viscous DNA; enzymes are already proteins. Option C is wrong because a DNA sample does not automatically melt a gel. Option D is wrong because DNA retains its negatively charged phosphate backbone; viscosity does not remove that charge. Gentle mixing, suitable dilution, and careful pipetting or cleanup can help, while avoiding harsh shearing. Memory cue: thick DNA means inaccurate volume and uneven mixing.

Related tags

Viscous DnaPipettingMixing

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