According to the precautionary principle, what should happen if there are fears that eating a food might cause a health problem?
a. people should be warned about the possible health problem.
b. the company producing the food should be warned about the possible health problem.
c. people who have fears about the food should test it to see if it causes a real health problem.
d. the company producing the food should test the food to prove that it does not cause a health problem.

The hershey and chase experiments involved the preparation of two different types of radioactively labeled phage. which of the following best explains why two preparations were required? a. the bacteriophage used in the experiments was a t2 phage. b. it was necessary that each of the two phage components, dna and protein, be identifiable upon recovery at the end of the experiment. c. each scientist had his own method for labeling phage, so each conducted the same experiment using a different isotope. d. establishing the identity of the genetic material required observation of two phage generations.