Which of these statements is true

a. writing your paper will require more than one draft
b. the tittle of research paper is the thesis statement
c. a reliable web resource presents opinions as facts
d. thesis statements, once written, cannot be revisited

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.