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Q.

In recombinant DNA technology antibiotic resistant genes are used 

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a

As selectable markers 

b

To keep medium bacteria free 

c

To initiate transcription process

d

To impart disease resistance in host cell

answer is A.

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Detailed Solution

The vector requires a selectable marker, which helps in identifying and eliminating non-transformants and selectively permitting the growth of the transformants. Normally, the genes encoding resistance to antibiotics such as ampicillin, chloramphenicol, tetracycline or kanamycin, etc., are considered useful selectable markers for E. coli. The normal E. coli cells do not carry resistance against any of these antibiotics.

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In recombinant DNA technology antibiotic resistant genes are used