Question

About protein, carbohydrates, lipids and nucleic acids, all things are common except.

• A. They are organic compounds essential for life.
• B. They all contain carbon.
• C. They all have functional groups.
• D. They all rich in nitrogen.

Answer 1

The correct option is D They all rich in nitrogen.

Protein and nucleic acids are biomolecules rich in nitrogen. Proteins are polymers of amino acids. Amino acids have nitrogen as component of amino group attached to the $\alpha$-carbon atom. Nucleic acids contain nitrogen in the nitrogenous bases, which are components of nucleotides. Carbohydrates and lipids are made up of carbon, hydrogen and oxygen. They lack nitrogen.