How are reagents useful in determine which macromolecules are present

Cells destroy body cells infected by a virus or bacteria.

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.

What is the difference between a meteoroid and a meteor?