When biologists speak of a universal genetic code they are referring to the fact that, in nearly all organisms, a) the dna sequences are identical. b) rna information is transcribed. c) rna specifies proteins the same way. d) phenotype is dependent upon genotype.

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.