Abacterial cell usually contains a single loop of dna that is located in the cytoplasm of the cell and is not surrounded by a nuclear membrane. some bacteria have additional loops of dna called plasmids. plasmids can be used for genetic engineering because dna from other organisms can be spliced into a plasmid loop. for example, scientists in the late 20th century discovered a way to insert the portion of human dna that codes for the protein insulin into the plasmid of e. coli bacteria. which statement best explains why these genetically modified bacteria have been useful to society?

They can be used to genetically modify organisms, such as the first GMO food, the Flavr Savr Tomato. It was injected with plasmids from modified bacteria in order to give the tomato a much longer shelf life and not spoil. There are much more useful applications for this, such as potentially stopping cancer cells from replicating and multiplying within someone's body, or to make corn grow faster with bigger yields. In the future, it could be the answer to the problem of the quick expansion of our population.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion