Question

which two molecules form the sides (backbone) of the dna double helix?
deoxyribose and a hydrogen bond
deoxyribose and the nucleus
deoxyribose and adenine
deoxyribose and phosphate

Explanation:

The DNA double - helix backbone is composed of deoxyribose sugar molecules and phosphate groups that alternate. Hydrogen bonds hold the two strands together, the nucleus is the cell organelle where DNA is located, and adenine is a nitrogen - base. So the correct combination for the backbone is deoxyribose and phosphate.

Answer:

deoxyribose and phosphate