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Adsorption onto a solid phase support followed by elution is used as an alternative for separation of which component?

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Adsorption onto a solid phase support followed by elution is used as an alternative for separation of which component?

(a) chromosomal DNA

(b) plasmid DNA

(c) RNA alone

(d) other impurities

I have been asked this question during an interview for a job.

My question comes from Purification of Plasmid DNA topic in portion Basics of Genetic Engineering of Genetic Engineering

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The correct answer is (b) plasmid DNA

The explanation: This method is used for separation of plasmid DNA. It is advantageous because it avoids the use of phenol and also removes RNA at times along with plasmid DNA.

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