Nitrogen is NOT an essential constituents of

Nitrogen is a fundamental element found in many biological molecules, but it is not an essential constituent of carbohydrates. Carbohydrates are organic compounds primarily composed of carbon (C), hydrogen (H), and oxygen (O), typically following the general formula Cn(H2O)m.

• Chlorophyll: This pigment contains nitrogen in its porphyrin ring structure, which coordinates with a central magnesium atom.
• DNA and RNA: These nucleic acids are composed of nucleotides, which include nitrogenous bases (adenine, guanine, cytosine, and thymine or uracil). Nitrogen is a core component of these bases.

While certain modified polysaccharides like chitin contain nitrogen, it is not a basic constituent of standard carbohydrates such as glucose, sucrose, or starch.