Plasmids containing antibiotic resistance genes are widely used in gene cloning and other molecular biology techniques. What is the major benefit of using plasmids containing genes for antibiotic resistance? The plasmids allow cells to grow in the presence of antibiotic and kill competing bacteria. Plasmids provide a means of selection of the bacteria that have picked up the plasmid. Plasmids provide a means of selection of the bacteria that contain the desired insert. Plasmids allow insert DNA sequences to be incorporated into the host cell genome. The plasmids provide protection against natural antibiotics produced by other bacteria in culture.
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Antibiotic resistance genes are often found on R plasmids (see Natural Gene Transfer and Antibiotic Resistance). A likely source of the R plasmids is bacteria that produce the antibiotic. Why would some bacteria produce antibiotics (chemicals that kill bacteria) and why would they carry R plasmids?
Adi S.
Plasmid genes can be disrupted. Bacterial cells are resistant to antibiotics used for bacterial identification. Bacterial cells can survive when grown in the presence of antibiotics. The plasmids containing the antibiotic resistance gene can be identified by the production of a colored reporter product, such as fluorescence. Restriction enzymes are key enzymes used in molecular biology. They can cut DNA at specific sites, creating either sticky ends or blunt ends. Gene cloning is the process of creating recombinant DNA. A plasmid is a small, circular DNA molecule. Plasmids play a role in gene cloning by providing a vehicle for the insertion of foreign DNA into a host organism. DNA ligase is an enzyme that joins DNA fragments together. Insulin production involves various techniques and processes, which can be illustrated in a flow diagram.
Sri K.
A geneticist uses a plasmid for cloning that has the lacZ gene and a gene that confers resistance to penicillin. The geneticist inserts a piece of foreign DNA into a restriction site that is located within the lacZ gene and uses the plasmid to transform bacteria. Explain how the geneticist can identify bacteria that contain a copy of a plasmid with the foreign DNA.
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