Which of the following is not a characteristic of the T-Cell line? A. Regulatory (or suppressor) T-cell inhibit the immune response
B. Cells are matured in the thymus gland
C. The cells originate in bone marrow from stem cells
D. T-Helper cells stimulate both the humoral and cell-mediated response

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.