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Question

Restriction endonucleases are utilised in genetic engineering techniques as
  1. Molecular cement for combining DNA bits into long chains.
  2. Molecular scalpels for cutting DNA at specific sites.
  3. Molecular build up nucleotides in tandem.
  4. Molecular scalpels for cutting DNA break up.

A
Molecular cement for combining DNA bits into long chains.
B
Molecular scalpels for cutting DNA break up.
C
Molecular build up nucleotides in tandem.
D
Molecular scalpels for cutting DNA at specific sites.
Solution
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Restriction enzymes are DNA-cutting enzymes found in bacteria and harvested from them for use. Because they cut within the molecule, they are often called restriction endonucleases. A restriction enzyme recognizes and cuts DNA only at a particular sequence of nucleotides. So, restriction endonucleases are utilised in genetic engineering techniques as molecular scalpels for cutting DNA at specific sites. Thus, option B is correct.

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