Which technique is useful to separate fragments after cutting DNA?

Correct answer: Agarose gel electrophoresis

Agarose gel electrophoresis separates cut DNA fragments according to their size. Smaller DNA fragments move farther through the gel than larger fragments, producing distinct bands. Centrifugation is mainly used to separate particles based on density or size, not to resolve DNA fragments as bands. Exam tip: For size-based separation of DNA fragments, remember agarose gel electrophoresis.