Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

4. Restriction endonuclease

Explanation:

Restriction endonuclease enzyme is known as the molecular scissor because a restriction enzyme recognizes and cuts the DNA only at a particular sequence of nucleotides and producing smaller fragments. 

Helicases are enzymes that bind and may even remodel nucleic acid or nucleic acid-protein complexes. There are DNA and RNA helicases are involved in the unwinding of the nucleic acids. 

In molecular biology, DNA ligase is a specific type of enzyme that facilitates the joining of DNA strands together by catalyzing the formation of a phosphodiester bond. 

The DNA polymerases are enzymes that create DNA molecules by assembling nucleotides, the building blocks of DNA.