The two molecules that alternate to form the backbone of a polynucleotide chain are:a. adenine and ...

The two molecules that alternate to form the backbone of a polynucleotide chain are:a.
   adenine and thymine.
  b. cytosine and guanine.
  c. sugar and phosphate.
  d. base and sugar.
  e. base and phosphate.

Question 2

The bacteriophages used in Alfred Hershey's and Martha Chase's experiments showed that:a.
   DNA was injected into bacteria.
  b. DNA and protein were injected into bacteria.
  c. DNA remained on the outer coat of bacteria.
  d. proteins were injected into bacteria.
  e. proteins were responsible for the production of new viruses within the bacteria.