A genome library consists of a large collection of bacterial cultures, in each of which a different segment of the genomic DNA of an organism has been cloned by recombinant DNA technology, so that the entire collection represents its complete genome. The analogy between a library of books and a genome library is based on the fact that both genes [...]
These are endonucleases which cleave double-stranded DNA molecules at specific sites having a sequence of generally four to six nucleotides. These sites are called restriction sites. A specific restriction enzyme cleaves DNA wherever the site occurs. The nucleotide sequence of the restriction site is specific for each of hundreds of restriction enzymes discovered so far from different microorganisms. A restriction [...]
In this article we will discuss about the three main types of vectors used in cloning for larger molecules of DNA. The types of vectors are: 1. Plasmid Vectors 2. Bacteriophage Vectors 3. Cosmid Vectors. 1. Plasmid Vectors: Plasmids are the extra chromosomal genetic elements commonly found in bacteria and are mostly made of double-stranded circular DNA. They are used [...]