Explain, in your own words, how our plasmid isolation procedure selectively purifies plasmid DNA and avoid contaminating the plasmid sample with chromosomal DNA.

1. Both the chromosome and plasmid are circular pieces of DNA in a bacterial cell. Explain, in your own words, how our plasmid isolation procedure selectively purifies plasmid DNA and avoid contaminating the plasmid sample with chromosomal DNA. (3 points)