Which of the following elements is NOT generally found in proteins?

Correct option is D

The correct answer is (D) Phosphorus
Explanation:
• Proteins are composed of C, H, O, N, and sometimes sulfur.
• Phosphorus is not a component of proteins; it is found in DNA, RNA, ATP, and phospholipids.
Information Booster:
• Basic unit of proteins = Amino acids.
• Amino acids contain amino group (–NH₂) and carboxyl group (–COOH).
• Bond linking amino acids = Peptide bond.