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Gel electrophoresis is used for:

1. cutting of DNA into fragments
2. separation of DNA fragments according to their size
3. construction of recombinant DNA by joining with cloning vectors
4. isolation of DNA molecule

Correct answer: separation of DNA fragments according to their size

Solution

Gel electrophoresis separates DNA fragments based on size because DNA is negatively charged and migrates through a gel under an electric field. Smaller fragments move more easily through the pores of the gel, so they travel farther than larger ones.

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