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In genetic engineering, the antibiotics are used:

1. as selectable markers.
2. to select healthy vectors.
3. to keep the cultures free of infection.
4. as sequences from where replication starts.

Correct answer: as selectable markers.

Solution

Antibiotics are used with resistance genes to select only the cells that have successfully taken up the recombinant vector. Cells without the vector are killed, so the antibiotic acts as a selectable marker.

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