Question

the model shows the chemical structure of a molecule. this molecule is a building block of which type of biomolecule? carbohydrate protein lipid nucleic acid

Explanation:

The molecule shown has a sugar - phosphate backbone and a nitrogen - containing base, which are characteristic components of nucleotides. Nucleotides are the building blocks of nucleic acids. Carbohydrates have a different general structure mainly composed of carbon, hydrogen, and oxygen in a 1:2:1 ratio. Proteins are made up of amino acids which have an amino group, a carboxyl group, and a variable R - group. Lipids are a diverse group including fats, phospholipids, etc., with structures distinct from the given molecule.

Answer:

D. nucleic acid