Which of the following is a benefit of genetic engineering? Recombinant DNA can create gene combinations never seen in nature. Genetic abnormalities can be used for job discrimination. Genetically engineered organisms are often sterile. Genetically engineered proteins can help fight disease.

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.