When cattle are slaughtered and processed, E. coli bacteria in their intestines can get on the meat. Ground beef combines meat from many different animals, increasing the risk of contamination. E. coli bacteria on a cow's udder or on milking equipment can get into raw milk or runoff from cattle farms can contaminate fields where fresh produce is grown. Certain vegetables, such as spinach and lettuce, are particularly vulnerable to this type of contamination.
Yes. A tort is an act performed by a person subject to law, that leaves them liable to federal infringement. This, in turn, possibly will put them in jail, depending on the offense performed by that person.
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Answer:
The correct option among them is option 'C'
The isolated DNA will show one band in the ultracentrifuge tube, which consistent with semiconservative replication.
Explanation:
The Meselson Stahl experiment shows DNA replicates by semiconservative mechanism.E.coli cells initially were grpwn in a medium containing ammonium chloride prepared with heavy isotope of nitrogen (¹⁵N) until all the cellular DNA was labeled. After the cells were transferred to a medium containing the normal light isotope of nitrogen (¹⁴N), samples were removed periodically from the cultures and the DNA in each sample was analyzed by equilibrium density gradient centrifugation. This technique can separate heavy heavy (¹⁵N-¹⁵N) , light light(¹⁴N-¹⁴N) and heavy-light (¹⁵N-¹⁴N) ds DNA into distinct bands.
After one generation of growth, all the extracted DNA had the density of ¹⁵N-¹⁴N DNA. After two generations, approximately half the DNA has density of ¹⁵N-¹⁴N DNA and on the other hand,the density of ¹⁴N-¹⁴N DNA.
With additional generations,a large fraction of the extracted DNA consisted of ¹⁴N-¹⁴N duplexes and ¹⁵N-¹⁵N duplexes never appeared.