Question

what is this structure a building block for? *
options:
○ protein
○ carbohydrate
○ lipid

Explanation:

The structure shown is a general amino acid, which has an amino group ($\text{-NH}_2$), a carboxyl group ($\text{-COOH}$), a hydrogen atom, and a variable R-group attached to a central carbon. Amino acids are the monomeric building blocks that link together via peptide bonds to form proteins. Carbohydrates are built from monosaccharides, and lipids are typically formed from fatty acids and glycerol, which do not match this structure.

Answer:

Protein