Question

atoms of what element form the backbone of large, complex molecules such as sugars and fats?
carbon
oxygen
sodium
sulfur
possible points: 1

Explanation:

Large, complex molecules like sugars (carbohydrates) and fats (lipids) have a carbon - based backbone. Carbon has the unique ability to form four covalent bonds, allowing it to create long chains, rings, and complex structures that serve as the framework for these biomolecules. Oxygen, sodium, and sulfur do not have the structural properties to form the backbone of such large, complex organic molecules.

Answer:

A. carbon