Question

proteins differ from fats and carbohydrates in that proteins
o a. are high - energy compounds
o b. are formed by dehydration synthesis
o c. contain nitrogen
o d. exist in chains
saturated fats are in structure while unsaturated fats are

Explanation:

• Option a: Fats are also high - energy compounds (more energy per gram than carbohydrates), so this is not a unique feature of proteins.
• Option b: Both proteins (from amino acids) and carbohydrates (from monosaccharides) and fats (from glycerol and fatty acids) are formed by dehydration synthesis.
• Option c: Proteins are made of amino acids, which contain nitrogen. Fats (composed of glycerol and fatty acids) and carbohydrates (composed of carbon, hydrogen, and oxygen) do not contain nitrogen.
• Option d: Carbohydrates (e.g., polysaccharides like starch) and proteins (polypeptide chains) can exist in chains. Fats can also have a kind of chain - like structure in their fatty acid tails.

Answer:

C. contain nitrogen