Which of these is a characteristic of a parasite? A. It is a helpful organism. B. it lives inside or on a host. C. It makes its own food. D. It is always visible to the naked eye.

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.