Which of the following molecules is the subunit of DNA that links together to form strands of DNA?
A.
a phosphate base
B.
a polymerase
C.
a codon
D.
a nucleotide
Nucleotides (adenine and thymine, guanine and cytosine) pair up to form strands of DNA. A five-carbon sugar base with a polymerase head makes up the subunits of nucleotides. Therefore, your answer is D.
