Plasmids often carry genes that may benefit the survival of the organism for antibiotic resistance
A plasmid (conjugative plasmid) that has a resistance gene on it, can transfer itself to another bacterial cell (called conjugation) or assist in the transfer of a non-conjuga … tive plasmid that has a resistance gene to another cell (called mobilization). Making the world better, one answer at a time. Plasmids are spare loops of bacterial DNA that often contain various traits that are not necessary to survival. However, most traits found in plasmids are beneficial under certain circumstances, such as drug resistance. If a bacteria is drug resistant, it has the gene or genes (which are often found on plasmids) that give it the resistance A plasmid is a small DNA molecule within a cell that is physically separated from a chromosomal DNA and can replicate independently. The normal number of copies of plasmid that may be found in a single cell is called the copy number, and is determined by how the replication initiation is regulated and the size of the molecule. Larger plasmids tend to have lower copy number. In order for the plasmids to replicate independently within a cell, they must possess a stretch of DNA that can act as an origin of replication. The self-replicating unit, in this case the plasmid, is called a replicon. The normal number of copies of plasmid that may be found in a single cell is called the copy number, and is determined by how the replication initiation is regulated and the size of the molecule. Larger plasmids tend to have lower copy number. They are most commonly found in bacteria as small, circular, double-stranded DNA molecules; however, plasmids are sometimes present in archaea and eukaryotic organisms. In nature, plasmids often carry genes that may benefit the survival of the organism, for example antibiotic resistance. The normal number of copies of plasmid that may be found in a single cell is called the copy number, and is determined by how the replication initiation is regulated and the size of the molecule. Larger plasmids tend to have lower copy number. The role that tris-HCI plays in plasmid isolation is to maintain  the pH of the solution. This prevents degradation of the plasmids.  Tris stands for the organic compound,  … tris(hydroxymethyl)aminomethane, which is a common pH buffer. HCl  is a salt acid called hydrochloride. Making the world better, one answer at a time. Plasmids are spare loops of bacterial DNA that often contain various traits that are not necessary to survival. However, most traits found in plasmids are beneficial under certain circumstances, such as drug resistance. If a bacteria is drug resistant, it has the gene or genes (which are often found on plasmids) that give it the resistanc 1 Virtually all plasmids that are used to deliver DNA contain genes for antibiotic resistance. 2  Once bacteria have been treated with a plasmid, scientists grow them in the presence of antibiotic. 3  Only those cells that contain the plasmid will survive, grow and reproduce. Plasmids help bacteria to survive stress. Antibiotic resistance. Plasmids contain just a few genes, but they make a big difference to their host bacterium. The genes are usually not essential for the bacterium’s day-to-day survival – instead, they help the bacterium to overcome occasional stressful situations. Key Concepts: Multiple antibiotic resistance represents a serious and growing clinical problem with regard to bacterial infections in humans. Resistance genes are commonly found on plasmids, which are small extrachromosomal elements commonly found in bacteria. Plasmids can vary widely with regard to their size and copy number in the cell. Genes conferring antibiotic resistance are commonly found on elements known as integrons and transposons, which facilitate movement between different replicons such as between the bacterial chromosome and a plasmid. 1 One more key use of plasmids is to make large amounts of proteins. 2  In this case, researchers grow bacteria containing a plasmid harboring the gene of interest. 3  Just as the bacteria produce proteins to confer its antibiotic resistance; it can also be induced to produce large amounts of proteins from the inserted gene. 1 Next, the plasmids are inserted into bacteria by a process called “Transformation”. 2  Then, the bacteria are exposed to the particular antibiotics. 3  Only bacteria which take up copies of the plasmid survive, since the plasmid makes them resistant. Bacterial DNA – a circular chromosome plus plasmids. The DNA of most bacteria is contained in a single circular molecule, called the bacterial chromosome. The chromosome, along with several proteins and RNA molecules, forms an irregularly shaped structure called the nucleoid. This sits in the cytoplasm of the bacterial cell. Plasmids help bacteria to survive stress. Antibiotic resistance. Plasmids contain just a few genes, but they make a big difference to their host bacterium. The genes are usually not essential for the bacterium’s day-to-day survival – instead, they help the bacterium to overcome occasional stressful situations.
http://www.answers.com/Q/Role_of_plasmids_in_drug_resistance https://en.wikipedia.org/wiki/Plasmid https://en.wikipedia.org/wiki/Plasmid https://en.wikipedia.org/wiki/Plasmid http://www.answers.com/Q/Role_of_plasmids_in_drug_resistance http://biotechlearn.org.nz/themes/bacteria_in_biotech/bacterial_dna_the_role_of_plasmids http://www.els.net/WileyCDA/ElsArticle/refId-a0001491.html http://www.innovateus.net/health/what-are-plasmids http://biotechlearn.org.nz/themes/bacteria_in_biotech/bacterial_dna_the_role_of_plasmids
what is the role of plasmids in antibiotic resistance