What are proteins primarily made of?

Proteins are primarily made of amino acids, which are organic compound building blocks essential for various bodily functions. Amino acids link together through peptide bonds to form long chains that create proteins, each with a unique sequence that determines its structure and function in the body.

These macromolecules play critical roles, such as serving as enzymes that catalyze biochemical reactions, being structural components in cells, facilitating transport and storage of molecules, and functioning in immune responses.

The other options do not accurately represent the primary components of proteins. Sugars are carbohydrates that provide energy, fatty acids are building blocks of lipids and fats, and enzymes are specialized proteins that catalyze reactions, but they themselves are made of amino acids. Thus, the correct answer highlights the foundational building block for proteins.