Question

an amino acid is to a protein as a_____ is to a complex carbohydrate.
lipid
fatty acid
nucleotide
sterol
monosaccharide

Explanation:

Amino acids are the building blocks of proteins. Complex carbohydrates (polysaccharides) are made up of simple sugar units called monosaccharides, so monosaccharides are their building blocks. The other options are components of different biomolecules: lipids (fats), fatty acids (lipid components), nucleotides (nucleic acid components), and sterols (a type of lipid). Thus, monosaccharide is the correct answer.

Answer:

monosaccharide