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Which of the following particles is used in the gene gun method?

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Which of the following particles is used in the gene gun method?

(a) Iron particles

(b) Aluminum particles

(c) Silver particles

(d) Gold particles

The question was posed to me during an internship interview.

This intriguing question originated from Introduction of DNA to Host Cell topic in section Recombinant DNA Technology of Life Sciences

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Correct answer is (d) Gold particles

The best I can explain: Gene gun fires gold particles coated with the foreign DNA to the plant genome. Some of these particles pass through plant nucleus and integrate with the plant chromosome.

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