All of these choices are true. DNA is well suited as the genetic material because a. DNA contains a. carbon, hydrogen, oxygen, nitrogen, and phosphorus. Chargaff's rules state that the a. content of purines in a molecule of DNA always equals the content of pyrimidines. All of these choices are true.
Gel electrophoresis separates molecules of DNA on the basis of a. size.
Zigzag, or Z-, DNA 18. The Tm, or melting temperature, of a strand of DNA is influenced by a. salt concentration. All of these choices are true. The rate of renaturation of two strands of DNA can be increased by a. increasing the reaction temperature to 25 degrees C above Tm. DNA is made up of a ribose sugar, phosphoric acid, and four nitrogenous bases.