Asubstance that moves across a cell membrane without using the cells energy tends to move?

Which statement best compares aerobic and anaerobic respiration

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?

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.