A) molecular bluid up at nucleotides
B) molecular degradation to DNA breakup
C) molecular knives for cutting DNA at specific sites
D) molecular cement to combine DNA sites
Correct Answer: B
Solution :
Restriction endonuclease enyzmes are used to cut DNA molecule at specific sites. These are the main enzymes in genetic engineering, which cleave the DNA to generate a nick of with a 5' phosphoryl and 3' hydroxyl terminus for the insertion of desired foreign DNA segment.
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