Which of the following terms describes the scales of an artichoke? petal

bract

corolla

petiole

Which of the following conclusions can be drawn

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

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.