Question

the dna backbone is composed of _______. amino acids phosphate groups sugars nitrogenous bases

Explanation:

The DNA backbone is made up of alternating sugar (deoxyribose) and phosphate groups. Amino acids are building - blocks of proteins, not part of the DNA backbone. Nitrogenous bases are attached to the sugar in DNA but are not part of the backbone structure.

Answer:

phosphate groups, sugars