GATE 2021 BT – Question 19
Which technique is NOT used for inserting a foreign gene into a cell?
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Show answer and explanation
Correct answer: (A) DNA microarray
Explanation
The question asks for the technique that is **not** used to insert a foreign gene into a cell.
- **DNA microarray:** a chip carrying thousands of DNA probes, used to measure gene expression or detect sequences by hybridisation. It analyses nucleic acids but does not deliver genes into cells. ✓ (the answer)
- **Electroporation:** an electric pulse makes pores in the membrane so DNA enters.
- **Gene gun:** DNA-coated particles are fired into cells.
- **Microinjection:** DNA is injected into a cell or nucleus with a fine needle.
Answer **DNA microarray** (A).