LIFE SCIENCE

Detailed explanation-1: -Proteins, carbohydrates and lipids are made from three basic molecules: carbon, hydrogen and oxygen. However, all proteins contain an element not found in carbohydrates and lipids is nitrogen. Nitrogen which is present in all amino acids (the building blocks that make up the protein chains).

Detailed explanation-2: -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-3: -In addition to carbon, hydrogen, and oxygen atoms, all proteins contain nitrogen and sulfur atoms, and many also contain phosphorus atoms and traces of other elements. Proteins serve a variety of roles in living organisms and are often classified by these biological roles.

Detailed explanation-4: -The answer is a, nitrogen and sulfur. Nitrogen is found in virtually every single amino acid, being an important part of the protein backbone. Some of the amino acid side groups also include nitrogen atoms, like histidine. Sulfur is also among the elements found in protein side groups, in cysteine and methionine.

Detailed explanation-5: -Carbohydrates and lipids are made of carbon, hydrogen, and oxygen (CHO). Proteins are made of carbon, hydrogen, oxygen, nitrogen, & sometimes sulfur (CHONS).