1. Carbohydrates:

* Subunits: Monosaccharides (simple sugars), such as glucose, fructose, and galactose. These monomers can link together to form disaccharides (like sucrose) or polysaccharides (like starch and cellulose).

2. Lipids (Fats):

* Subunits: Glycerol and fatty acids. Glycerol is a three-carbon molecule with hydroxyl groups, while fatty acids are long chains of hydrocarbons with a carboxyl group at one end.

3. Proteins:

* Subunits: Amino acids. There are 20 different amino acids, each with a unique side chain that gives it specific properties. Amino acids link together to form polypeptide chains, which then fold into complex three-dimensional structures to create proteins.

4. Nucleic Acids:

* Subunits: Nucleotides. Nucleotides are composed of a sugar (ribose or deoxyribose), a phosphate group, and a nitrogenous base (adenine, guanine, cytosine, thymine, or uracil). Nucleotides link together to form long chains, such as DNA and RNA.

Let me know if you'd like more detail about any of these compounds!