Which of the following are considered as useful selectable markers for E.coli?
(a) Ampicillin resistance gene
(b) Chloramphenicol resistance gene
(c) Tetracycline resistance gene
(d) Kanamycin resistance gene
Choose the correct option.

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a only

a, b, c and d

a and b only

a, b and c only

answer is D.

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Detailed Solution

All of the options (a) Ampicillin resistance gene, (b) Chloramphenicol resistance gene, (c) Tetracycline resistance gene, and (d) Kanamycin resistance gene are considered useful selectable markers for E. coli. These genes allow researchers to select for bacteria that have taken up a plasmid or undergone a genetic transformation based on their resistance to specific antibiotics.

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