What are proteins as biomolecules?

Proteins:

1. Proteins are big, complicated molecules that contain oxygen, carbon, nitrogen, hydrogen, and occasionally sulfur.
2. Proteins are made up of thousands of smaller components called amino acids that are linked together to form a polypeptide chain (proteins).
3. Proteins are made up of 20 different types of amino acids that unite to form a single molecule.
4. These amino acids are similar, however, their side chains are different.
5. Proteins are required for the execution of complex activities as well as DNA creation and regeneration.
6. Enzymes are proteins that aid in the digestion of food.