Amino acids are organic compounds that combine to form proteins. They are often referred to as the building blocks of proteins. Each amino acid contains a basic amino group (NH2), an acidic carboxyl group (COOH), and a unique side chain.
The correct answer to the question 'Amino acids are found in' is Proteins.
Proteins are crucial for the structure, function, and regulation of the body's tissues and organs. Unlike carbohydrates or fats, proteins consist of various sequences of amino acids, which define their functions and characteristics.
Therefore, the correct answer is: