Here's a breakdown of what makes a molecule a macromolecule:

* Size: Macromolecules are generally considered to be large molecules with molecular weights of at least 10,000 daltons.

* Structure: They are typically formed by the joining of smaller repeating units called monomers.

* Types: The four major types of biological macromolecules are:

* Carbohydrates: Made up of sugar monomers.

* Lipids (fats and oils): Made up of fatty acid monomers.

* Proteins: Made up of amino acid monomers.

* Nucleic Acids (DNA and RNA): Made up of nucleotide monomers.

Examples of macromolecules:

* Starch: A complex carbohydrate made up of many glucose monomers.

* Proteins: Like enzymes, antibodies, and hormones, are complex structures made up of chains of amino acids.

* DNA: A very long molecule that carries genetic information, made up of nucleotides.

Let me know if you'd like to know more about a specific macromolecule!