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Added a note about drug resistance as a technique for DNA purification.
Drug resistance also arises in viruses. For example, the anti-flu drug Oseltamivir (Tamiflu) was only introduced in the year 2000, and did not receive widespread use until 2004; yet in 2007, type B influenza infections resistant to the drug were observed in Japan.<ref>Johnson, Carla K (2007), "Strain of flu shows resistance to drugs; Findings in Japan trouble scientists", Associated Press, ''The Boston Globe,'' April 4, 2007</ref>
Drug resistance also arises in viruses. For example, the anti-flu drug Oseltamivir (Tamiflu) was only introduced in the year 2000, and did not receive widespread use until 2004; yet in 2007, type B influenza infections resistant to the drug were observed in Japan.<ref>Johnson, Carla K (2007), "Strain of flu shows resistance to drugs; Findings in Japan trouble scientists", Associated Press, ''The Boston Globe,'' April 4, 2007</ref>
Drug resistance is also used in many molecular biology techniques. A plasmid containing a gene of interest and a gene for antibiotic resistance is transformed into a strain of bacteria (usually E.Coli) via chemical or electrical means. The bacteria is then plated onto media containing the antibiotic corresponding to the gene of antibiotic resistance. Only bacteria that have taken up the plasmid containing the antibiotic resistance gene can grow on the media. The plasmid containing the gene of interest can then be purified via alkaline lysis.
==Notes and references==
==Notes and references==