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Which of the following is not required in the preparation of recombinant DNA molecule ?
(a) Restriction endonuclease
(b) DNA ligase
(c) DNA fragments
(d) E. coli

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(d) Genetic engineering or r-DNA technology can be accomplished only if we have the key tools:
(1) Restriction enzymes
(2) Polymerase enzymes
(3) Ligases (4) Vectors
(4) Host organism

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