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a
PCR- Cohen
b
DNA ligase- Break genomic DNA into fragments
c
Taq polymerase- Heat labile DNA polymerase
d
Ampicillin resistance gene in pBR 322- Selectable marker
answer is D.
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Detailed Solution
The genes encoding resistance to antibiotics such as ampicillin, chloramphenicol, tetracycline or kanamycin, etc., are considered useful selectable markers which helps in identifying and eliminating non-transformants and selectively permitting the growth of the transformants.