"the process used to remove excess water from the paramecium by the contractile vacuole is
(1)synthesis
(2)digestion
(3)active transport
(4)passive transport
"

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.