An electron microscope forms an image by focusing beams of electrons onto a specimen. true or false.

Restless tectonic plates move (shift) between one and fifteen centimeters per year month day minute

20 the compound al(nh3)2 has atoms of nitrogen.

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.