Question

dna has ____ and __ groups on the outside, and the ____ connecting the two strands on the inside of the helix.
a bases, sugar, phosphate
b sugar, paired bases, phosphate
c sugar, phosphate, paired bases
d none of the above

Explanation:

DNA has a double - helix structure. The sugar - phosphate backbone is on the outside of the helix. The paired bases (adenine - thymine and cytosine - guanine) are on the inside of the helix and connect the two strands through hydrogen bonds.

Answer:

C. sugar, phosphate, paired bases