Question

Which of the following elements form the storage elements?

• A. C, N, S, P
• B. Ca, C, N, K
• C. N, P, K, B
• D. Ca, B, N, O

Answer 1

Answer: (A)

C, N, S, P

The living systems are made up of a variety of biomolecules, like carbohydrates, proteins, lipids, nucleic acids, glycoproteins, proteoglycans, sulpholipids, phospholipids etc.

All simple and conjugate proteins are polymers of amino acids. There are 21 types of amino acids commonly found in living systems.

Amino acids are made up of nitrogen, carbon, hydrogen and oxygen. In addition some amino acids also contain sulphur. Similarly phospholipids, nucleotides and other biomolecules contain phosphorous. Hence, carbon, hydrogen, oxygen, nitrogen, phosphorous and sulphur are also known as the protoplasmic elements. Out of these carbon, hydrogen and oxygen are known as framework elements. Nitrogen, phosphorous and sulphur are indispensable for synthesis of lipids, proteins, nucleotides and a variety of storage biomolecules.

So, the correct answer is 'C, N, S, P'