LIFE SCIENCE

Detailed explanation-1: -Proteins are compounds composed of carbon, hydrogen, oxygen, and nitrogen, which are arranged as strands of amino acids . They play an essential role in the cellular maintenance, growth, and functioning of the human body.

Detailed explanation-2: -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.

Detailed explanation-3: -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-4: -Proteins are complex, organic compounds composed of many amino acids linked together through peptide bonds and cross-linked between chains by sulfhydryl bonds, hydrogen bonds and van der Waals forces.

Detailed explanation-5: -Answer and Explanation: Proteins are thus, made up of amino acids and are present in plants, animals, and microorganisms.