In the human body, most cells take in very small amounts of iodine. Cells of the thyroid gland,
however, depend on much higher iodine
concentrations. Which method of transportation
would you predict thyroid cells use to take in
iodine? Construct an argument to support your
prediction.

In trying to determine whether dna or protein is the genetic material, hershey and chase made use of which of the following facts? a) dna contains sulfur, whereas protein does not. b) dna contains phosphorus, whereas protein does not. c) dna contains nitrogen, whereas protein does not. d) dna contains purines, whereas protein includes pyrimidines.