Group 3 (proteins, DNA, fats, starch) contains only molecules that are each assembled from smaller organic compounds.
Proteins are biomolecules composed of smaller subunits called amino acids, which are linked by peptide bonds.
The deoxyribonucleic acid (DNA) is a biomolecule composed of smaller subunits called nucleotides, which are linked by phosphodiester bonds and hydrogen bonds.
Fats are a broad category of biomolecules composed of subunits called fatty acids.
Starch is a complex carbohydrate composed of smaller subunits called monosaccharides (i.e., glucose monomers), which are linked glycosidic bonds.
In conclusion, Group 3 (proteins, DNA, fats, starch) contains only molecules that are each assembled from smaller organic compounds.
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