A bacterial culture is being grown in a medium containing a light isotope of nitrogen (14N), it is moved to a medium containing a heavier isotope of nitrogen (15N). After twenty minutes you take a DNA sample and spin it down in cesium chloride by centrifugation and see one distinct band of DNA. Twenty minutes later you take another sample and see two distinct bands of DNA with the second being heavier than the first. If you took another sample twenty minutes after that (after a third replication) how many bands would there be given the semi-conservative model is true

Recently, crops of vegetables such as lettuce and green onions have been contaminated, while they are still on the farm, with bacteria that cause food poisoning. how will science influence the way the government responds to prevent an increase in food-borne diseases? because science has shown that lettuce and green onions are not nutritionally valuable, the government may pass laws that ban the sale of lettuce and green onions. because science has shown that there is no way to prevent bacterial contamination, the government may pass laws that punish businesses that buy lettuce and green onions. because science has shown that the washing of hands prevent the spread of infectious diseases among people, the government may pass laws that require hand washing by everyone who handles food. because science has shown there are ways to find the source of the contamination, the government may pass laws that require farm practices that reduce the contamination of lettuce and green onions.