Question

question 1 of 10
a model of dna is shown.
what is structure 1?
a. a strand end
b. a hydrogen bond
c. a sugar - phosphate backbone
d. a nitrogenous base

Explanation:

In a DNA model, the outer sides (Structure 1) are composed of the sugar - phosphate backbone. The nitrogenous bases are the inner - paired structures. Hydrogen bonds hold the base pairs together. And the strand ends are at the 3' and 5' positions shown as Structure 3.

Answer:

C. A sugar - phosphate backbone