biology help dna

The DNA used as a carrier for transferring a fragment of foreign DNA into a suitable host is called vehicle DNA. Two types of DNA are used as vehicles: plasmid DNA and bacteriophage DNA..

The bacteriophages (or phages), are viruses that infect and kill bacteria. Their circular DNA is also suitable for use as a vehicle DNA..

The most significant feature of DNA molecule is its capacity to make its own identical copies. This property is called replication. It occurs regularly during the synthetic phase of the cell cycle, every time a cell divides. During replication, the DNA molecule unwinds itself fr..

It refers to small fragments formed by breaking a chromosome of an organism with the help of restriction endonucleas..

The structure of the DNA molecule and the arrangement of nitrogenous bases in the two polynucleotide chains, is very well explained by the double helix model proposed by Watson and Crick in 1953. Watson and Crick According to the double helix model, DNA molecule shows the f..

It is the DNA synthesised with the help of DNA polymerases on the DNA template or from free deoxybironucleotides without a templat..

The DNA to be used as passenger or vehicle is isolated from the cell by lysing it with a suitable enzyme. The DNA is then isolated from other cell contents by ultracentrifugation and purified. Both the passenger and the vehicle DNA's are subsequently cleaved by using t..

In 1961, Kornberg and his coworkers synthesized DNA from a mixture of deoxyribonucleoside triphosphates, DNA polymerase enzyme, metal ions and a segment of viral DNA functioning as a primer. The synthetic DNA showed biological activity. When introdu..

Recombination of DNA Technology - It is the most widely used technique in genetic engineering. It involves the formation of recombinant DNA and its introduction into an appropriate host. Recombinant DNA is the DNA formed by combining DNAs from different organ..

It is the most widely used technique in genetic engineering. It involves the formation of recombinant DNA and its introduction into an appropriate host. Recombinant DNA is the DNA formed by combining DNAs from different organisms. The technique requires skilful handlin..