A) are endonucleases which cleave DNA at specific sites
B) make DNA complementary to an existing DNA or RNA
C) cut or join DNA fragments
D) are required in vectorless direct gene transfer
Correct Answer: A
Solution :
Restriction endonucleases or restriction enzymes cleave DNA at specific sites when nucleotides of the two strands form inverted base sequence and are symmetrical around a given point., e.g., \[EcoR-I,\,\,SMA-I\].
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