It contains a phosphate group for every nucleotide. a. dna b. rna c. both dna and rna d. neither dna nor rna

            The correct option is c ( both DNA and RNA).

Reason:
            Both DNA and RNA is made from samll unit called nucleotide. Each nucleotide is composed of three components:
1. pentose sugar
2. phosphate group, and
3. nitrogenous base. 

The structure of nucleotide is given in figure.
 

Writing, you can revisit previous parts of the lesson by returning to the course map. be sure to refer to the lab’s student guide, which you can find on the first page of the lab experiment activity