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Question

"Molecular scissors" used in genetic engineering is

A
Helicase
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B
DNA ligase
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C
DNA polymerase
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D
Restriction endonuclease
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Solution

The correct option is D Restriction endonuclease
  • 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.

Thus, the correct answer is option D.

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