The term genetic engineering originally referred to various processes used to modify and manipulate organisms via heredity and r
eproduction. Starting during the latter part of the 20th century, however, the term refers more specifically to recombinant DNA methods in which DNA molecules from different sources are combined in-vitro then inserted into a host organism, ultimately altering the organism’s DNA. Recombinant DNA technology is based around restriction enzymes that were discovered by the Swiss microbiologist Werner Arber in 1968. True or false?
During the late 1950s and early 1960s, Werner Arber and several others extended the work of an earlier Nobel laureate, Salvador Luria, who observed that bacteriophages (viruses that infect bacteria) not only induce hereditary mutations in their bacterial hosts but at the same time undergo hereditary mutations themselves. Werner Arber’s research was concentrated on the action of protective enzymes present in the bacteria, which modify the DNA of the infecting virus e.g., the restriction enzyme, so-called for its ability to restrict the growth of the bacteriophage by cutting the molecule of its DNA to pieces.
It replenishes your supply of glucose to boost your energy levels and alertness, while also providing other essential nutrients required for good health.
The Roosevelt Corollary was an addition to the Monroe Doctrine. It stated that no European countries were allowed to intervene in Latin American affairs. The only way that the U.S was allowed to become involved was if the affairs or European countries was threatened.
Angular unconformity is an unconformity where horizontally parallel strata of sedimentary rock are deposited on tilted and eroded layers, producing an angular discordance with the overlying horizontal layers. The whole sequence may later be deformed and tilted by further orogenic activity.
