Even though there is no clear-cut time at which gerontologists all agree one joins the oldest old, with increases in longevity, the term is most commonly referring to people age and over. a. 80 b. 75 c. 90 d. 85

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.