The polymerase chain reaction (pcr) has revolutionized biology and medicine, by allowing small regions of dna to be amplified up to a billion-fold over 30 cycles in a few hours. each cycle involves heating the dna to 95°c to separate the two strands, the sample is then cooled to allow primers to bind, and finally the temperature is raised to the optimal temperature for the dna polymerase to replicate the dna. this process makes use of the dna polymerase from a species of bacteria isolated from hot springs, thermus aquaticus, which grows at 70°c. human body temperature is 37°c. what would you predict about the dna polymerase from t. aquaticus compared with dna polymerases from human cells?

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.