Here's a breakdown:
* Sugar: This refers to the deoxyribose sugar molecule that is part of each nucleotide.
* Phosphate: This refers to the phosphate group that is attached to the sugar.
* Backbone: This term emphasizes the structural role of these molecules. They form a continuous chain that runs along the outside of the DNA helix.
The sugar-phosphate backbone provides the structural support for the DNA molecule and plays a crucial role in holding the two strands of the double helix together.
