A) synthesized by dog
B) present in mammalian cells for degradation of DNA
C) used for in vitro DNA synthesis
D) used in genetic engineering
Correct Answer: D
Solution :
Genetic engineering was made possible by the discovery and development of a number of tools and techniques. Perhaps most important was the discovery of restriction endonucleases which are produced by bacterial cells. These enzymes can be used to cut DNA from different sources into pieces that are easy to recombine in vitro means in glass i.e., in test tube
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