BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Nitrogen is an element invariably found in proteins but not in all carbohydrates and lipids.

Detailed explanation-2: -Proteins are made up of amino acids, which are small molecules. Protein is a micronutrient, which is essential for muscle growth. Therefore, nitrogen is the element that is only present in proteins but not in lipids or carbohydrates.

Detailed explanation-3: -Since both the functional groups are attached to the a-carbon so they are called a-amino acids. So, nitrogen is only present in proteins and not in carbohydrates and lipids.

Detailed explanation-4: -Proteins contain the elements carbon, hydrogen, and oxygen just as carbohydrates and lipids do, but proteins are the only macronutrient that contains nitrogen.

Detailed explanation-5: -Answer and Explanation: A feature of amino acids not found in carbohydrates is the presence of nitrogen atoms. Amino acids are the building blocks of proteins, and they contain carbon, hydrogen, oxygen and nitrogen atoms.