Question

Which molecules are called molecular scissors? Why are they called so?

Answer 1

Restriction enzymes are called molecular scissors.
Each restriction endonuclease inspects the length of a DNA sequence. Once it finds its specific recognition sequence, it will bind to the DNA and cut each of the two strands of the double helix at specific points in their sugar-phosphate backbones. Each restriction endonuclease recognises specific palindromic nucleotide sequences in the DNA.