What differentiates passive transport from active transport? A. Proteins have a role in passive transport.

B. Molecules move down a concentration gradient during passive transport.

C. Passive transport involves molecules moving across the cell membrane.

D. ATP is needed for passive transport to occur.

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.