Question

the \backbone\ of the dna molecule consists of what molecule(s)?
select all that apply
a phosphate
b nitrogen bases
c ribose
d deoxyribose

Explanation:

The DNA backbone is formed by alternating sugar and phosphate groups. Deoxyribose is the sugar specific to DNA (ribose is for RNA), and nitrogen bases are the "rungs" of the DNA ladder, not part of the backbone.

Answer:

a. phosphate
d. deoxyribose