MCQ
Restriction endonucleases are used as:
- AMolecular build up at nucleotides
- BMolecular degradation to break up a $\text{DNA}$
- ✓Molecular knives for cutting $\text{DNA}$ at specific sites
- DMolecular cement to combine $\text{DNA}$ sites
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Reason : If several spermatozoa hit the egg at same time, all can enter the egg.