Carl's throat hurt. he could not swallow to eat so his mother took him to the doctor's. doctor roberts swabbed carl's throat and rubbed the swab on a petri dish. "what's that for? " asked carl. doctor roberts told him that many time severe sore throats are caused by a specific and culturing carl's throat will to identify it.

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.