4. Using Slides #4-#9 complete the table below by determining the average diameter of urchins captured in each sample area.
Sample area
Average urchin diameter (cm)
Willapa Bay
Sitka Tribe
Ketchikan
South Slough Estuary
Point Conception
La Push
Average of all sample areas combined

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.