Anti-receptor antibodies can block hormone entry or stimulate the receptor (like original hormone). Use your diagram to explain the consequences to both thyroxin and TSH levels if the auto-antibodies: a. block the thyroxin receptors on the pituitary. b. stimulate the thyroxin receptors on the pituitary. c. block the TSH receptors on the thyroid. d. stimulate the TSH receptors on the thyroid.

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.