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 vector less direct gene transfer
Correct Answer: A
Solution :
The process of genetic engineering was made possible by the discovery of restriction enzymes that exist in many bacteria. These enzymes are called called restriction endonucleases. 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, eg, Eco R I, SMA-I.
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