Which element is always present in proteins but never in simple carbohydrates or triglycerides?
Correct answer: B. Nitrogen
- A. Phosphorus
- B. Nitrogen
- C. Magnesium
- D. Calcium
Explanation
Every amino acid carries an amino group, so nitrogen is a constant feature of proteins, and sulphur also appears in some. Simple carbohydrates and triglycerides contain only carbon, hydrogen and oxygen, and phosphorus is confined to compounds such as phospholipids and nucleic acids.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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