NEET 2012 Biology question

In genetic engineering, the antibiotics are used

(1)To keep the cultures free of infection
(2)As selectable markersCorrect
(3)To select healthy vectors
(4)As sequences from where replication starts

Answer: (2)

Solution

In genetic engineering, genes for antibiotic resistance (e.g. ampicillin, tetracycline, kanamycin resistance genes) are placed on the vector and serve as selectable markers: only host cells that have taken up the vector survive on a medium containing the antibiotic, so

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Question ID VK-091048