Proteins, nucleic acids, and carbohydrates are all macromolecules, meaning they are large molecules made up of smaller repeating subunits. Here's what they have in common:

* Built from smaller monomers: They are all constructed from smaller building blocks called monomers.

* Proteins: Made of amino acids

* Nucleic acids (DNA & RNA): Made of nucleotides

* Carbohydrates: Made of simple sugars (monosaccharides)

* Essential for life: They are all essential for the functioning of living organisms.

* Proteins: Provide structure, transport, enzymes, hormones, etc.

* Nucleic acids: Store and transmit genetic information.

* Carbohydrates: Provide energy, structural support, and cell recognition.

* Contain carbon: They are all organic molecules, meaning they contain carbon.

Let me know if you want to explore any of these points in more detail!