Biology Biotechnology Principles and Processes Cloning Vectors and Competent Host Single Correct MCQ
Published on: August 12, 2026

Genetic engineering in possible because-

A
The pheromenan of transduction in bacteria is well understood.
B
We can see DNA by electron microscope
C
We can cut DNA at specific sites by endonucleare like DNA ase
D
Restriction endonucleare purified from bacteria can be used in vitro.

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The correct answer is:
D

Genetic engineering became possible mainly because restriction endonucleases, isolated from bacteria, can cut DNA at specific sequences outside the living cell (in vitro). This allows controlled cutting and recombination of DNA for recombinant DNA technology.

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