It is advantageous for animals that migrate to store energy in the form of lipids rather than carbohydrates. this is because a) lipids do not form polymers. b) lipids are more dense than carbohydrates. c) carbohydrates do not supply energy to cells. d) lipids weigh less and store more energy (gram for gram) than carbohydrates.

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.